New

var zao,wan,yearjs,monthjs,dayjs,riseSetForm_mos_selectedIndex;
var eqTimejs;//riseSetForm["eqTime"].value
var solarDecjs;//riseSetForm["solarDec"].value
var shiqu;//latLongForm["hrsToGMT"].value
var latDegjs;//f["latDeg"].value
var latMinjs;//f["latMin"].value == latLongForm["latMin"].value
var latSecjs;//f["latSec"].value == latLongForm["latSec"].value
var lonMinjs;//f["lonMin"].value == latLongForm["lonMin"].value
var lonSecjs;//f["lonSec"].value == latLongForm["lonSec"].value
var lonDegjs;//f["lonDeg"].value == latLongForm["lonDeg"].value
var latDegjs;//latLongForm["latDeg"].value

var utcsunrisejs;//riseSetForm["utcsunrise"].value //日出世界时
var solnoonjs;//riseSetForm["solnoon"].value //正午时间当地时
var utcsolnoonjs;//riseSetForm["utcsolnoon"].value //正午时间世界时
//输出日出日落时间
var sunrisejsD;//输出时间标签的id的text()方法; //riseSetForm["sunrise"].value //日出当地时id
var sunrisejs="js_sunrise";//输出时间标签的id的text()方法; //riseSetForm["sunrise"].value //日出当地时id
var sunsetjsd;//输出时间标签的id的text()方法; //riseSetForm["sunset"].value //日落当地时id
var sunsetjs="js_sunset";//输出时间标签的id的text()方法; //riseSetForm["sunset"].value //日落当地时id

(function(){ latDegjs='29.3';//景德镇经纬度;city(("#"+sunsetjs).text(val);//sunsetjs id值见上面定义末尾
}
function js_sunrisejs_J(val){
$("#"+sunrisejs).text(val);//sunsetjs id值见上面定义末尾
}

//计算日出日落开始
function month(name, numdays, abbr)
{
this.name = name;
this.numdays = numdays;
this.abbr = abbr;
}
function ans(daySave,value)
{
this.daySave = daySave;
this.value = value;
}
function city(name, lat, lng, zoneHr)
{
this.name = name;
this.lat = lat;
this.lng = lng;
this.zoneHr = zoneHr;
}
var monthList = new Array(); // list of months and days for non-leap year
var i = 0;
monthList[i++] = new month("一月", 31, "Jan");
monthList[i++] = new month("二月", 28, "Feb");
monthList[i++] = new month("三月", 31, "Mar");
monthList[i++] = new month("四月", 30, "Apr");
monthList[i++] = new month("五月", 31, "May");
monthList[i++] = new month("六月", 30, "Jun");
monthList[i++] = new month("七月", 31, "Jul");
monthList[i++] = new month("八月", 31, "Aug");
monthList[i++] = new month("九月", 30, "Sep");
monthList[i++] = new month("十月", 31, "Oct");
monthList[i++] = new month("十一月", 30, "Nov");
monthList[i++] = new month("十二月", 31, "Dec");
var YesNo = new Array(); //Daylight Saving array
i=0;
YesNo[i++] = new ans("No",0);
YesNo[i++] = new ans("Yes",60);
var City = new Array();

j = 0;
City[j++] = new city("",0,0,0);
City[j++] = new city("中国城市",0,0,0);
City[j++] = new city("北京", 39.9,-115.4,-8);
City[j++] = new city("天津", 39.1,-116.2,-8);
City[j++] = new city("上海", 31.2, -120.4,-8);
City[j++] = new city("石家庄",38.0,-113.4,-8);
City[j++] = new city("太原", 37.8,-111.5,-8);
City[j++] = new city("呼和浩特",40.8,-110.7,-8);
City[j++] = new city("大连", 38.9,-120.6,-8);
City[j++] = new city("沈阳",41.8,-122.4,-8);
City[j++] = new city("长春",43.9,-124.3,-8);
City[j++] = new city("吉林", 43.8,-125.5,-8);
City[j++] = new city("哈尔滨",45.7,-125.6,-8);
City[j++] = new city("济南",36.6,-117.0,-8);
City[j++] = new city("青岛",36.0,-119.3,-8);
City[j++] = new city("烟台",37.5,-120.4,-8);
City[j++] = new city("西安",34.2,-107.9,-8);
City[j++] = new city("兰州",36.0,-102.7,-8);
City[j++] = new city("西宁",36.6,-100.8,-8);
City[j++] = new city("南京",32.0,-117.7,-8);
City[j++] = new city("无锡",31.5,-119.3,-8);
City[j++] = new city("苏州",31.3,-119.6,-8);
City[j++] = new city("徐州",34.2,-116.1,-8);
City[j++] = new city("合肥",31.8,-116.6,-8);
City[j++] = new city("杭州",30.2,-119.1,-8);
City[j++] = new city("宁波",29.8,-120.5,-8);
City[j++] = new city("南昌",28.6,-114.9,-8);
City[j++] = new city("九江",29.7,-114.9,-8);
City[j++] = new city("武汉",30.5,-113.2,-8);
City[j++] = new city("长沙",28.2,111.9,-8);
City[j++] = new city("湘潭",27.8,-111.9,-8);
City[j++] = new city("乌鲁木齐",43.8,-86.6,-8);
City[j++] = new city("哈密",42.8,-92.4,-8);
City[j++] = new city("桂林",25.2,-109.2,-8);
City[j++] = new city("柳州",24.3,-108.4,-8);
City[j++] = new city("南宁",22.8,-107.3,-8);
City[j++] = new city("广州",23.1,-112.2,-8);
City[j++] = new city("汕头",23.3,-115.6,-8);
City[j++] = new city("海口",20.0,-109.3,-8);
City[j++] = new city("成都",30.6,-103.1,-8);
City[j++] = new city("重庆",29.5,-105.5,-8);
City[j++] = new city("贵阳",26.6,-105.7,-8);
City[j++] = new city("昆明",25.0,-101.7,-8);
City[j++] = new city("拉萨",29.6,-90.1,-8);
City[j++] = new city("郑州",34.7,-112.6,-8);
City[j++] = new city("洛阳",34.6,-111.4,-8);
City[j++] = new city("福州",26.6,-118.3,-8);
City[j++] = new city("厦门",24.4,-117.1,-8);
City[j++] = new city("台北",25.0,-120.5,-8);  
City[j++] = new city("高雄",22.0,-101.3,-8);
City[j++] = new city("香港",22.25,-114.1667,-8);
City[j++] = new city("景德镇",29.3,-117.2,-8);
City[j++] = new city("世界城市",0,0,0);
City[j++] = new city("纽约,美国",40.7167,74.0167,5);
City[j++] = new city("柏林,德国",52.33, -13.30, -1);
City[j++] = new city("孟买,印度", 18.9333, -72.8333, -5.5);
City[j++] = new city("布宜诺斯艾利斯, 阿根廷", -34.60,58.45,3);
City[j++] = new city("开罗,埃及", 30.10,-31.3667,-2);
City[j++] = new city("开普敦,南非",-33.9167,-18.3667,-2);
City[j++] = new city("加拉加斯,委内瑞拉", 10.50,66.9333,4);
City[j++] = new city("赫尔辛基,芬兰", 60.1667, -24.9667,-2);
City[j++] = new city("洛杉机,美国",34.05,118.233,8);
City[j++] = new city("耶路撒冷,巴基斯坦", 31.7833, -35.2333, -2);
City[j++] = new city("伦敦,英国", 51.50, 0.1667,0);
City[j++] = new city("墨西哥城,墨西哥", 19.4,99.15,6);
City[j++] = new city("莫斯科,俄罗斯", 55.75, -37.5833, -3);
City[j++] = new city("新德里,印度",28.6, -77.2, -5.5);
City[j++] = new city("渥太华,加拿大", 45.41667,75.7,5);
City[j++] = new city("巴黎,法国", 48.8667, -2.667, -1);
City[j++] = new city("圣保罗,巴西",-22.90,43.2333,3);
City[j++] = new city("利雅得,沙特阿拉伯", 24.633, -46.71667, -3);
City[j++] = new city("罗马,意大利",41.90, -12.4833,-1);
City[j++] = new city("悉尼,澳大利亚",-33.8667,-151.2167,-10);
City[j++] = new city("东京,日本", 35.70, -139.7667, -9); 
City[j++] = new city("苏黎世,瑞士", 47.3833, -8.5333,-1);

function setLatLong(f, index)
{
    // Decimal degrees are passed in the array.  Temporarily store these 
    // degs in lat and lon deg and have convLatLong modify them.

    latDeg = City[index].lat;
    lonDegjs = City[index].lng;

    // These are needed to prevent iterative adding of min and sec when 
    // set button is clicked.

    latMinjs = 0;
    latSecjs = 0;
    lonMinjs = 0;
    lonSecjs = 0;
    
    //call convLatLong to convert decimal degrees into table form.

    convLatLong(f);

    //Local time zone value set in table

    shiqu =  City[index].zoneHr;
}

function isLeapYear(yr) 
{
    return ((yr % 4 == 0 && yr % 100 != 0) || yr % 400 == 0);
}

function isPosInteger(inputVal) 
{
    inputStr = ("" + inputVal);
    for (var i = 0; i < inputStr.length; i++) {
        var oneChar = inputStr.charAt(i);
        if (oneChar < "0" || oneChar > "9")
            return false;
    }
    return true;
}

function isInteger(inputVal) 
{
    inputStr = "" + inputVal;
    if(inputStr == "NaN") return false;
    if(inputStr == "-NaN") return false;
    for (var i = 0; i < inputStr.length; i++) 
    {
        var oneChar = inputStr.charAt(i);
        if (i == 0 && (oneChar == "-" || oneChar == "+"))
        {
            continue;
        }
        if (oneChar < "0" || oneChar > "9")
        {
            return false;
        }
    }
    return true;
}

function isNumber(inputVal) 
{
    var oneDecimal = false;
    var inputStr = "" + inputVal;
    for (var i = 0; i < inputStr.length; i++) 
    {
        var oneChar = inputStr.charAt(i);
        if (i == 0 && (oneChar == "-" || oneChar == "+"))
        {
            continue;
        }
        if (oneChar == "." && !oneDecimal) 
        {
            oneDecimal = true;
            continue;
        }
        if (oneChar < "0" || oneChar > "9")
        {
            return false;
        }
    }
    return true;
}


function isValidInput(f, index, latLongForm) 
{
    if (dayjs == "") 
    {   //  see if the day field is empty
        alert("You must enter a day before attempting the calculation.");
        return false;
    }
    else if (yearjs == "") 
    {   //   see if the year field is empty
        alert("You must enter a year before attempting the calculation.");
        return false;
    }
    else if (!isPosInteger(dayjs) || dayjs == 0)
    {
        alert("The day must be a positive integer.");
        return false;
    }
    else if (!isInteger(yearjs)) 
    {
        alert("The year must be an integer.");
        return false;
    }
    else if ( (yearjs < -1000) || (yearjs > 3000) )
    {
        alert("The algorithm used is not valid for years outside of/nthe range -1000 to 3000.");
        return false;
    }


    else if ((index != 1) && (dayjs > monthList[index].numdays)) 
    {
        alert("There are only " + monthList[index].numdays + " days in " 
            + monthList[index].name + ".");
        return false;
    }

    else if (index == 1) 
    {   
        if (isLeapYear(yearjs)) {   //  year entered is a leap year
            if (dayjs > (monthList[index].numdays + 1)) 
            {
                alert("There are only " + (monthList[index].numdays + 1) 
                    + " days in " + monthList[index].name + ".");
                return false;
            }
            else
                return true;
        }
        else 
        {   //  year entered is not a leap year
            if (dayjs > monthList[index].numdays) 
            {
                alert("There are only " + monthList[index].numdays 
                    + " days in " + monthList[index].name + ".");
                return false;
            }
            else
                return true;
        }
    }
    else 
        return true;    
}

function convLatLong(f)
{
    var neg = 0;
    if(latDeg[0] == '-') 
    {
        neg = 1;
    }

    if(neg != 1)
    {
        var latSeconds = (parseFloat(latDeg))*3600 
            + parseFloat(latMinjs)*60 
            + parseFloat(latSecjs)*1;

        latDeg = Math.floor(latSeconds/3600);
        latMinjs = Math.floor((latSeconds
            - (parseFloat(latDeg)*3600))/60);
        latSecjs = Math.floor((latSeconds
            - (parseFloat(latDeg)*3600) 
            - (parseFloat(latMinjs)*60)) + 0.5);
    }
    else if(parseFloat(latDeg) > -1)
    {
        var latSeconds = parseFloat(latDeg)*3600 
            - parseFloat(latMinjs)*60 
            - parseFloat(latSecjs)*1;

        latDeg = "-0";
        latMinjs = Math.floor((-latSeconds)/60);
        latSecjs = Math.floor( (-latSeconds 
            - (parseFloat(latMinjs)*60)) + 0.5);

    }
    else
    {
        var latSeconds = parseFloat(latDeg)*3600 
            - parseFloat(latMinjs)*60 
            - parseFloat(latSecjs)*1;

        latDeg = Math.ceil(latSeconds/3600);
        latMinjs = Math.floor((-latSeconds
            + (parseFloat(latDeg)*3600))/60);
        latSecjs = Math.floor((-latSeconds
            + (parseFloat(latDeg)*3600) 
            - (parseFloat(latMinjs)*60)) + 0.5);
    }

    neg = 0;
    if(lonDegjs[0] == '-') 
    {
        neg = 1;
    }

    if(neg != 1)
    {
        var lonSeconds = parseFloat(lonDegjs)*3600 
            + parseFloat(lonMinjs)*60 
            + parseFloat(lonSecjs)*1;
        lonDegjs = Math.floor(lonSeconds/3600);
        lonMinjs = Math.floor((lonSeconds
            - (parseFloat(lonDegjs)*3600))/60);
        lonSecjs = Math.floor((lonSeconds
            - (parseFloat(lonDegjs)*3600)
            - (parseFloat(lonMinjs))*60) + 0.5);
    }
    else if(parseFloat(lonDegjs) > -1)
    {
        var lonSeconds = parseFloat(lonDegjs)*3600 
            - parseFloat(lonMinjs)*60 
            - parseFloat(lonSecjs)*1;

        lonDegjs = "-0";
        lonMinjs = Math.floor((-lonSeconds)/60);
        lonSecjs = Math.floor((-lonSeconds
            - (parseFloat(lonMinjs)*60)) + 0.5);
    }
    else
    {
        var lonSeconds = parseFloat(lonDegjs)*3600 
            - parseFloat(lonMinjs)*60 
            - parseFloat(lonSecjs)*1;
        lonDegjs = Math.ceil(lonSeconds/3600);
        lonMinjs = Math.floor((-lonSeconds
            + (parseFloat(lonDegjs)*3600))/60);
        lonSecjs = Math.floor((-lonSeconds
            + (parseFloat(lonDegjs)*3600)
            - (parseFloat(lonMinjs)*60)) + 0.5);
    }

    if(latSeconds > 324000)
    {
        alert("You have entered an invalid latitude.\n  Setting lat= 89.8.");
        latDeg = 89.8;
        latMinjs = 0;
        latSecjs = 0;
    }
    if(latSeconds < -324000)
    {
        alert("You have entered an invalid latitude.\n  Setting lat= -89.8.");
        latDeg = -89.8;
        latMinjs = 0;
        latSecjs = 0;
    }
    if(lonSeconds > 648000)
    {
        alert("You have entered an invalid longitude.\n Setting lon= 180.");
        lonDegjs = 180;
        lonMinjs = 0;
        lonSecjs = 0;
    }
    if(lonSeconds < -648000)
    {
        alert("You have entered an invalid longitude.\n Setting lon= -180.");
        lonDegjs = -180;
        lonMinjs = 0;
        lonSecjs =0;
    }

}


function radToDeg(angleRad) 
{
    return (180.0 * angleRad / Math.PI);
}
function degToRad(angleDeg) 
{
    return (Math.PI * angleDeg / 180.0);
}

function calcDayOfYear(mn, dy, lpyr) 
{
    var k = (lpyr ? 1 : 2);
    var doy = Math.floor((275 * mn)/9) - k * Math.floor((mn + 9)/12) + dy -30;
    return doy;
}

function calcDayOfWeek(juld)
{
    var A = (juld + 1.5) % 7;
    var DOW = (A==0)?"Sunday":(A==1)?"Monday":(A==2)?"Tuesday":(A==3)?"Wednesday":(A==4)?"Thursday":(A==5)?"Friday":"Saturday";
    return DOW;
}

function calcJD(year, month, day)
{
    if (month <= 2) {
        year -= 1;
        month += 12;
    }
    var A = Math.floor(year/100);
    var B = 2 - A + Math.floor(A/4);

    var JD = Math.floor(365.25*(year + 4716)) + Math.floor(30.6001*(month+1)) + day + B - 1524.5;
    return JD;
}

function calcDateFromJD(jd)
{
    var z = Math.floor(jd + 0.5);
    var f = (jd + 0.5) - z;

    if (z < 2299161) {
        var A = z;
    } else {
        alpha = Math.floor((z - 1867216.25)/36524.25);
        var A = z + 1 + alpha - Math.floor(alpha/4);
    }

    var B = A + 1524;
    var C = Math.floor((B - 122.1)/365.25);
    var D = Math.floor(365.25 * C);
    var E = Math.floor((B - D)/30.6001);

    var day = B - D - Math.floor(30.6001 * E) + f;
    var month = (E < 14) ? E - 1 : E - 13;
    var year = (month > 2) ? C - 4716 : C - 4715;

    // alert ("date: " + day + "-" + monthList[month-1].name + "-" + year);
    return (day + "-" + monthList[month-1].name + "-" + year);
}

function calcDayFromJD(jd)
{
    var z = Math.floor(jd + 0.5);
    var f = (jd + 0.5) - z;

    if (z < 2299161) {
        var A = z;
    } else {
        alpha = Math.floor((z - 1867216.25)/36524.25);
        var A = z + 1 + alpha - Math.floor(alpha/4);
    }

    var B = A + 1524;
    var C = Math.floor((B - 122.1)/365.25);
    var D = Math.floor(365.25 * C);
    var E = Math.floor((B - D)/30.6001);

    var day = B - D - Math.floor(30.6001 * E) + f;
    var month = (E < 14) ? E - 1 : E - 13;
    var year = (month > 2) ? C - 4716 : C - 4715;

    return ((day<10 ? "0" : "") + day + monthList[month-1].abbr);
}


function calcTimeJulianCent(jd)
{
    var T = (jd - 2451545.0)/36525.0;
    return T;
}

function calcJDFromJulianCent(t)
{
    var JD = t * 36525.0 + 2451545.0;
    return JD;
}


function calcGeomMeanLongSun(t)
{
    var L0 = 280.46646 + t * (36000.76983 + 0.0003032 * t);
    while(L0 > 360.0)
    {
        L0 -= 360.0;
    }
    while(L0 < 0.0)
    {
        L0 += 360.0;
    }
    return L0;      // in degrees
}

function calcGeomMeanAnomalySun(t)
{
    var M = 357.52911 + t * (35999.05029 - 0.0001537 * t);
    return M;       // in degrees
}

function calcEccentricityEarthOrbit(t)
{
    var e = 0.016708634 - t * (0.000042037 + 0.0000001267 * t);
    return e;       // unitless
}

function calcSunEqOfCenter(t)
{
    var m = calcGeomMeanAnomalySun(t);

    var mrad = degToRad(m);
    var sinm = Math.sin(mrad);
    var sin2m = Math.sin(mrad+mrad);
    var sin3m = Math.sin(mrad+mrad+mrad);

    var C = sinm * (1.914602 - t * (0.004817 + 0.000014 * t)) + sin2m * (0.019993 - 0.000101 * t) + sin3m * 0.000289;
    return C;       // in degrees
}

function calcSunTrueLong(t)
{
    var l0 = calcGeomMeanLongSun(t);
    var c = calcSunEqOfCenter(t);

    var O = l0 + c;
    return O;       // in degrees
}


function calcSunTrueAnomaly(t)
{
    var m = calcGeomMeanAnomalySun(t);
    var c = calcSunEqOfCenter(t);

    var v = m + c;
    return v;       // in degrees
}


function calcSunRadVector(t)
{
    var v = calcSunTrueAnomaly(t);
    var e = calcEccentricityEarthOrbit(t);

    var R = (1.000001018 * (1 - e * e)) / (1 + e * Math.cos(degToRad(v)));
    return R;       // in AUs
}

function calcSunApparentLong(t)
{
    var o = calcSunTrueLong(t);

    var omega = 125.04 - 1934.136 * t;
    var lambda = o - 0.00569 - 0.00478 * Math.sin(degToRad(omega));
    return lambda;      // in degrees
}

function calcMeanObliquityOfEcliptic(t)
{
    var seconds = 21.448 - t*(46.8150 + t*(0.00059 - t*(0.001813)));
    var e0 = 23.0 + (26.0 + (seconds/60.0))/60.0;
    return e0;      // in degrees
}

function calcObliquityCorrection(t)
{
    var e0 = calcMeanObliquityOfEcliptic(t);

    var omega = 125.04 - 1934.136 * t;
    var e = e0 + 0.00256 * Math.cos(degToRad(omega));
    return e;       // in degrees
}


function calcSunRtAscension(t)
{
    var e = calcObliquityCorrection(t);
    var lambda = calcSunApparentLong(t);

    var tananum = (Math.cos(degToRad(e)) * Math.sin(degToRad(lambda)));
    var tanadenom = (Math.cos(degToRad(lambda)));
    var alpha = radToDeg(Math.atan2(tananum, tanadenom));
    return alpha;       // in degrees
}

function calcSunDeclination(t)
{
    var e = calcObliquityCorrection(t);
    var lambda = calcSunApparentLong(t);

    var sint = Math.sin(degToRad(e)) * Math.sin(degToRad(lambda));
    var theta = radToDeg(Math.asin(sint));
    return theta;       // in degrees
}

function calcEquationOfTime(t)
{
    var epsilon = calcObliquityCorrection(t);
    var l0 = calcGeomMeanLongSun(t);
    var e = calcEccentricityEarthOrbit(t);
    var m = calcGeomMeanAnomalySun(t);

    var y = Math.tan(degToRad(epsilon)/2.0);
    y *= y;

    var sin2l0 = Math.sin(2.0 * degToRad(l0));
    var sinm   = Math.sin(degToRad(m));
    var cos2l0 = Math.cos(2.0 * degToRad(l0));
    var sin4l0 = Math.sin(4.0 * degToRad(l0));
    var sin2m  = Math.sin(2.0 * degToRad(m));

    var Etime = y * sin2l0 - 2.0 * e * sinm + 4.0 * e * y * sinm * cos2l0
            - 0.5 * y * y * sin4l0 - 1.25 * e * e * sin2m;

    return radToDeg(Etime)*4.0; // in minutes of time
}

function calcHourAngleSunrise(lat, solarDec)
{
    var latRad = degToRad(lat);
    var sdRad  = degToRad(solarDec)

    var HAarg = (Math.cos(degToRad(90.833))/(Math.cos(latRad)*Math.cos(sdRad))-Math.tan(latRad) * Math.tan(sdRad));

    var HA = (Math.acos(Math.cos(degToRad(90.833))/(Math.cos(latRad)*Math.cos(sdRad))-Math.tan(latRad) * Math.tan(sdRad)));

    return HA;      // in radians
}

function calcHourAngleSunset(lat, solarDec)
{
    var latRad = degToRad(lat);
    var sdRad  = degToRad(solarDec)

    var HAarg = (Math.cos(degToRad(90.833))/(Math.cos(latRad)*Math.cos(sdRad))-Math.tan(latRad) * Math.tan(sdRad));

    var HA = (Math.acos(Math.cos(degToRad(90.833))/(Math.cos(latRad)*Math.cos(sdRad))-Math.tan(latRad) * Math.tan(sdRad)));

    return -HA;     // in radians
}


function calcSunriseUTC(JD, latitude, longitude)
{
    var t = calcTimeJulianCent(JD);

    // *** First pass to approximate sunrise

    var eqTime = calcEquationOfTime(t);
    var solarDec = calcSunDeclination(t);
    var hourAngle = calcHourAngleSunrise(latitude, solarDec);

    var delta = longitude - radToDeg(hourAngle);
    var timeDiff = 4 * delta;   // in minutes of time
    var timeUTC = 720 + timeDiff - eqTime;  // in minutes

    // alert("eqTime = " + eqTime + "\nsolarDec = " + solarDec + "\ntimeUTC = " + timeUTC);

    // *** Second pass includes fractional jday in gamma calc

    var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + timeUTC/1440.0); 
    eqTime = calcEquationOfTime(newt);
    solarDec = calcSunDeclination(newt);
    hourAngle = calcHourAngleSunrise(latitude, solarDec);
    delta = longitude - radToDeg(hourAngle);
    timeDiff = 4 * delta;
    timeUTC = 720 + timeDiff - eqTime; // in minutes

    // alert("eqTime = " + eqTime + "\nsolarDec = " + solarDec + "\ntimeUTC = " + timeUTC);

    return timeUTC;
}

function calcSolNoonUTC(t, longitude)
{
    var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + 0.5 + longitude/360.0); 

    var eqTime = calcEquationOfTime(t);
    var solarNoonDec = calcSunDeclination(t);
    var solNoonUTC = 720 + (longitude * 4) - eqTime; // min
    
    return solNoonUTC;
}

function calcSunsetUTC(JD, latitude, longitude)
{
    var t = calcTimeJulianCent(JD);

    // First calculates sunrise and approx length of day

    var eqTime = calcEquationOfTime(t);
    var solarDec = calcSunDeclination(t);
    var hourAngle = calcHourAngleSunset(latitude, solarDec);

    var delta = longitude - radToDeg(hourAngle);
    var timeDiff = 4 * delta;
    var timeUTC = 720 + timeDiff - eqTime;

    // first pass used to include fractional day in gamma calc

    var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + timeUTC/1440.0); 
    eqTime = calcEquationOfTime(newt);
    solarDec = calcSunDeclination(newt);
    hourAngle = calcHourAngleSunset(latitude, solarDec);

    delta = longitude - radToDeg(hourAngle);
    timeDiff = 4 * delta;
    timeUTC = 720 + timeDiff - eqTime; // in minutes

    return timeUTC;
}


function getLatitude(latLongForm)
{
    var neg = 0;
    var degs = parseFloat(latDegjs);
    if (latDegjs[0] == '-') 
    {
        neg = 1;
    }

    var mins = parseFloat(latMinjs);

    var secs = parseFloat(latSecjs);

    if(neg != 1)
    {
        var decLat = degs + (mins / 60) + (secs / 3600);
    } 
    else if(neg == 1)
    {
        var decLat = degs - (mins / 60) - (secs / 3600);
    } else 
    {
        return -9999;
    }
    return decLat;
}   


function getLongitude(latLongForm)
{
    var neg = 0;
    var degs = parseFloat(lonDegjs);
    if (lonDegjs[0] == '-') 
    {
        neg = 1;
    }
    var mins = parseFloat(lonMinjs);
    var secs = parseFloat(lonSecjs);
    var decLon = degs + (mins / 60) + (secs / 3600);

    if(neg != 1)
    {
        var decLon = degs + (mins / 60) + (secs / 3600);
    } else if(neg == 1)
    {
        var decLon = degs - (mins / 60) - (secs / 3600);
    } else 
    {
        return -9999;
    }
    return decLon;
}   


function findRecentSunrise(jd, latitude, longitude)
{
    var julianday = jd;

    var time = calcSunriseUTC(julianday, latitude, longitude);
    while(!isNumber(time)){
        julianday -= 1.0;
        time = calcSunriseUTC(julianday, latitude, longitude);
    }

    return julianday;
}


function findRecentSunset(jd, latitude, longitude)
{
    var julianday = jd;

    var time = calcSunsetUTC(julianday, latitude, longitude);
    while(!isNumber(time)){
        julianday -= 1.0;
        time = calcSunsetUTC(julianday, latitude, longitude);
    }

    return julianday;
}

function findNextSunrise(jd, latitude, longitude)
{
    var julianday = jd;

    var time = calcSunriseUTC(julianday, latitude, longitude);
    while(!isNumber(time)){
        julianday += 1.0;
        time = calcSunriseUTC(julianday, latitude, longitude);
    }

    return julianday;
}

function findNextSunset(jd, latitude, longitude)
{
    var julianday = jd;

    var time = calcSunsetUTC(julianday, latitude, longitude);
    while(!isNumber(time)){
        julianday += 1.0;
        time = calcSunsetUTC(julianday, latitude, longitude);
    }

    return julianday;
}

function timeString(minutes)

{
    var floatHour = minutes / 60;
    var hour = Math.floor(floatHour);
    var floatMinute = 60 * (floatHour - Math.floor(floatHour));
    var minute = Math.floor(floatMinute);
    var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
    var second = Math.floor(floatSec);

    var timeStr = hour + ":";
    if (minute < 10)    //  i.e. only one digit
        timeStr += "0" + minute + ":";
    else
        timeStr += minute + ":";
    if (second < 10)    //  i.e. only one digit
        timeStr += "0" + second;
    else
        timeStr += second;

    return timeStr;
}

function timeStringShortAMPM(minutes, JD)
{
    var julianday = JD;
    var floatHour = minutes / 60;
    var hour = Math.floor(floatHour);
    var floatMinute = 60 * (floatHour - Math.floor(floatHour));
    var minute = Math.floor(floatMinute);
    var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
    var second = Math.floor(floatSec);
    var PM = false;

    minute += (second >= 30)? 1 : 0;

    if (minute >= 60) 
    {
        minute -= 60;
        hour ++;
    }

    var daychange = false;
    if (hour > 23) 
    {
        hour -= 24;
        daychange = true;
        julianday += 1.0;
    }

    if (hour < 0)
    {
        hour += 24;
        daychange = true;
        julianday -= 1.0;
    }

    if (hour > 11)
    {
        hour -= 12;
        PM = true;
    }

    if (hour == 0)
    {
        PM = false;
        hour = 12;
    }

    var timeStr = hour + ":";
    if (minute < 10)    //  i.e. only one digit
        timeStr += "0" + minute + ((PM)?"PM":"AM");
    else
        timeStr += "" + minute + ((PM)?"PM":"AM");

    if (daychange) return timeStr + " " + calcDayFromJD(julianday);
    return timeStr;
}


function timeStringAMPMDate(minutes, JD)
{
    var julianday = JD;
    var floatHour = minutes / 60;
    var hour = Math.floor(floatHour);
    var floatMinute = 60 * (floatHour - Math.floor(floatHour));
    var minute = Math.floor(floatMinute);
    var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
    var second = Math.floor(floatSec);

    minute += (second >= 30)? 1 : 0;

    if (minute >= 60) 
    {
        minute -= 60;
        hour ++;
    }

    if (hour > 23) 
    {
        hour -= 24;
        julianday += 1.0;
    }

    if (hour < 0)
    {
        hour += 24;
        julianday -= 1.0;
    }

    var PM = false;
    if (hour > 11)
    {
        hour -= 12;
        PM = true;
    }

    if (hour == 0)
    {
        PM = false;
        hour = 12;
    }

    var timeStr = hour + ":";
    if (minute < 10)    //  i.e. only one digit
        timeStr += "0" + minute + ((PM)?"PM":"AM");
    else
        timeStr += minute + ((PM)?"PM":"AM");

    return timeStr + " " + calcDayFromJD(julianday);
}

function timeStringDate(minutes, JD)
{
    var julianday = JD;
    var floatHour = minutes / 60;
    var hour = Math.floor(floatHour);
    var floatMinute = 60 * (floatHour - Math.floor(floatHour));
    var minute = Math.floor(floatMinute);
    var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
    var second = Math.floor(floatSec);

    minute += (second >= 30)? 1 : 0;

    if (minute >= 60) 
    {
        minute -= 60;
        hour ++;
    }

    var daychange = false;
    if (hour > 23) 
    {
        hour -= 24;
        julianday += 1.0;
        daychange = true;
    }

    if (hour < 0)
    {
        hour += 24;
        julianday -= 1.0;
        daychange = true;
    }

    var timeStr = hour + ":";
    if (minute < 10)    //  i.e. only one digit
        timeStr += "0" + minute;
    else
        timeStr += minute;

    if (daychange) return timeStr + " " + calcDayFromJD(julianday);
    return timeStr;
}


function calcSun(riseSetForm, latLongForm, index, index2) 
{
    if(index2 != 0)
    {
        setLatLong(latLongForm, index2);
    }

    var latitude = getLatitude(latLongForm);
    var longitude = getLongitude(latLongForm);
    var indexRS = riseSetForm_mos_selectedIndex;
    if (isValidInput(riseSetForm, indexRS, latLongForm)) 
    {
        if((latitude >= -90) && (latitude < -89.8))
        {
            alert("All latitudes between 89.8 and 90 S\n will be set to -89.8");
            latDegjs = -89.8;
            latitude = -89.8;
        }
        if ((latitude <= 90) && (latitude > 89.8))
        {
            alert("All latitudes between 89.8 and 90 N\n will be set to 89.8");
            latDegjs = 89.8;
            latitude = 89.8;
        }
        var JD = (calcJD(parseFloat(yearjs), indexRS + 1, parseFloat(dayjs)));
        var dow = calcDayOfWeek(JD);
        var doy = calcDayOfYear(indexRS + 1, parseFloat(dayjs), isLeapYear(yearjs));
        var T = calcTimeJulianCent(JD);
        var alpha = calcSunRtAscension(T);
        var theta = calcSunDeclination(T);
        var Etime = calcEquationOfTime(T);

        var eqTime = Etime;
        var solarDec = theta;

        eqTimejs = (Math.floor(100*eqTime))/100;
        solarDecjs = (Math.floor(100*(solarDec)))/100;

        var nosunrise = false;

        var riseTimeGMT = calcSunriseUTC(JD, latitude, longitude);
        if (!isNumber(riseTimeGMT))
        {
            nosunrise = true;
        }

        var nosunset = false;
        var setTimeGMT = calcSunsetUTC(JD, latitude, longitude);
        if (!isNumber(setTimeGMT))
        {
            nosunset = true;
        }

        var daySavings = YesNo[index].value;  // = 0 (no) or 60 (yes)
        var zone = shiqu;
        if(zone > 12 || zone < -12.5)
        {
            alert("The offset must be between -12.5 and 12.  \n Setting \"Off-Set\"=0");
            zone = "0";
            shiqu = zone;
        }

        if (!nosunrise)     // Sunrise was found
        {
            var riseTimeLST = riseTimeGMT - (60 * zone) + daySavings;   
                //  in minutes
            var riseStr = timeStringShortAMPM(riseTimeLST, JD);
            var utcRiseStr = timeStringDate(riseTimeGMT, JD);
            sunrisejsD=riseStr;
            var s1 = sunrisejsD[1]==":"?"0"+sunrisejsD.substring(0, 4):sunrisejsD.substring(0, 5);
            js_sunrisejs_J(s1);
            utcsunrisejs = utcRiseStr;
        }

        if (!nosunset)      // Sunset was found
        {
            var setTimeLST = setTimeGMT - (60 * zone) + daySavings;
            var setStr = timeStringShortAMPM(setTimeLST, JD);
            var utcSetStr = timeStringDate(setTimeGMT, JD);

            sunsetjsd = setStr;
            if(setStr.indexOf("PM")>0){
                if(setStr.indexOf(":")==1){
                    var ajs=parseInt(setStr.substring(0, 1));
                    ajs+=12;
                    sunsetjsd=ajs+setStr.substring(1, 4);
                }else{
                    var ajs=parseInt(setStr.substring(0, 2));
                    ajs+=12;
                    sunsetjsd=ajs+setStr.substring(1, 4);
                }
            }
            js_sunsetjs_J(sunsetjsd);

// riseSetForm["utcsunset"].value = utcSetStr;
}

        var solNoonGMT = calcSolNoonUTC(T, longitude);
        var solNoonLST = solNoonGMT - (60 * zone) + daySavings;

        var solnStr = timeString(solNoonLST);
        var utcSolnStr = timeString(solNoonGMT);

        solnoonjs = solnStr;
        utcsolnoonjs = utcSolnStr;
        convLatLong(latLongForm);


        if(nosunrise)
        { 
            utcsunrisejs = "";
            if ( ((latitude > 66.4) && (doy > 79) && (doy < 267)) ||
               ((latitude < -66.4) && ((doy < 83) || (doy > 263))) )
            {
                newjd = findRecentSunrise(JD, latitude, longitude);
                newtime = calcSunriseUTC(newjd, latitude, longitude)
                     - (60 * zone) + daySavings;
                if (newtime > 1440)
                {
                    newtime -= 1440;
                    newjd += 1.0;
                }
                if (newtime < 0)
                {
                    newtime += 1440;
                    newjd -= 1.0;
                }
                sunrisejsD = 
                    timeStringAMPMDate(newtime, newjd);
                utcsunrisejs = "prior sunrise";
            }

            else if ( ((latitude > 66.4) && ((doy < 83) || (doy > 263))) ||
                ((latitude < -66.4) && (doy > 79) && (doy < 267)) )
            {
                newjd = findNextSunrise(JD, latitude, longitude);
                newtime = calcSunriseUTC(newjd, latitude, longitude)
                     - (60 * zone) + daySavings;
                if (newtime > 1440)
                {
                    newtime -= 1440;
                    newjd += 1.0;
                }
                if (newtime < 0)
                {
                    newtime += 1440;
                    newjd -= 1.0;
                }
                sunrisejsD = 
                    timeStringAMPMDate(newtime, newjd);
                utcsunrisejs = "next sunrise";
            }
            else 
            {
                alert("Cannot Find Sunrise!");
            }

        }

        if(nosunset)
        { 

// riseSetForm["utcsunset"].value = "";

            if ( ((latitude > 66.4) && (doy > 79) && (doy < 267)) ||
               ((latitude < -66.4) && ((doy < 83) || (doy > 263))) )
            {
                newjd = findNextSunset(JD, latitude, longitude);
                newtime = calcSunsetUTC(newjd, latitude, longitude)
                     - (60 * zone) + daySavings;
                if (newtime > 1440)
                {
                    newtime -= 1440;
                    newjd += 1.0;
                }
                if (newtime < 0)
                {
                    newtime += 1440;
                    newjd -= 1.0;
                }
                sunsetjsd = 
                    timeStringAMPMDate(newtime, newjd);
                if(setStr.indexOf("PM")>0){
                    if(setStr.indexOf(":")==1){
                        var ajs=parseInt(setStr.substring(0, 1));
                        ajs+=12;
                        sunsetjsd=ajs+setStr.substring(1, 4);
                    }else{
                        var ajs=parseInt(setStr.substring(0, 2));
                        ajs+=12;
                        sunsetjsd=ajs+setStr.substring(1, 4);
                    }
                }
                js_sunsetjs_J(sunsetjsd);

// riseSetForm["utcsunset"].value = "next sunset";
utcsolnoonjs = "";
}

            else if ( ((latitude > 66.4) && ((doy < 83) || (doy > 263))) ||
                ((latitude < -66.4) && (doy > 79) && (doy < 267)) )
            {
                newjd = findRecentSunset(JD, latitude, longitude);
                newtime = calcSunsetUTC(newjd, latitude, longitude)
                     - (60 * zone) + daySavings;
                if (newtime > 1440)
                {
                    newtime -= 1440;
                    newjd += 1.0;
                }
                if (newtime < 0)
                {
                    newtime += 1440;
                    newjd -= 1.0;
                }
                sunsetjsd = 
                    timeStringAMPMDate(newtime, newjd);
                if(setStr.indexOf("PM")>0){
                    if(setStr.indexOf(":")==1){
                        var ajs=parseInt(setStr.substring(0, 1));
                        ajs+=12;
                        sunsetjsd=ajs+setStr.substring(1, 4);
                    }else{
                        var ajs=parseInt(setStr.substring(0, 2));
                        ajs+=12;
                        sunsetjsd=ajs+setStr.substring(1, 4);
                    }
                }
                js_sunsetjs_J(sunsetjsd);

// riseSetForm["utcsunset"].value = "prior sunset";
solnoonjs = "N/A";
utcsolnoonjs = "";
}

            else 
            {
                alert ("Cannot Find Sunset!");
            }
        }
    }
}

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