通过经纬度计算日升日落时间

// 通过经纬度获取日出日落时间

//  纬度、精度、时区

  computeSunRiseSunSet(Latitude, Longitude, TimeZone) {

    function parseTime(aTime) {

      var aDateTimeObject = 'none';

      if (aTime !== undefined && aTime.length) {

        var aDate = new Date();

        var aDateAdjustedToGMTInMS = aDate.getTime() + (aDate.getTimezoneOffset() * 60 * 1000);

        aDateTimeObject = new Date(aDateAdjustedToGMTInMS);

        try {

          var theHour = parseInt(aTime.split(':')[0]);

          var theMinutes = parseInt(aTime.split(':')[1]);

          aDateTimeObject.setHours(theHour);

          aDateTimeObject.setMinutes(theMinutes);

        } catch (ex) {}

      }

      return aDateTimeObject;

    }

    var curTime = new Date();

    // Variable names used: B5, C, C2, C3, CD, D, DR, H, HR, HS, L0, L5, M, MR, MS, N, PI, R1, RD, S1, SC, SD, str

    var retVal = new Object();

    var PI = Math.PI;

    var DR = PI / 180;

    var RD = 1 / DR;

    var B5 = Latitude;

    var L5 = Longitude;

    var H = -1 * (curTime.getTimezoneOffset() / 60 * -1); // Local timezone

    // Overriding TimeZone to standardize on UTC

    // H = 0;

    var M = curTime.getMonth() + 1;

    var D = curTime.getDate();

    B5 = DR * B5;

    var N = parseInt(275 * M / 9) - 2 * parseInt((M + 9) / 12) + D - 30;

    var L0 = 4.8771 + .0172 * (N + .5 - L5 / 360);

    var C = .03342 * Math.sin(L0 + 1.345);

    var C2 = RD * (Math.atan(Math.tan(L0 + C)) - Math.atan(.9175 * Math.tan(L0 + C)) - C);

    var SD = .3978 * Math.sin(L0 + C);

    var CD = Math.sqrt(1 - SD * SD);

    var SC = (SD * Math.sin(B5) + .0145) / (Math.cos(B5) * CD);

    if (Math.abs(SC) <= 1) {

      var C3 = RD * Math.atan(SC / Math.sqrt(1 - SC * SC));

      var R1 = 6 - H - (L5 + C2 + C3) / 15;

      var HR = parseInt(R1);

      var MR = parseInt((R1 - HR) * 60);

      retVal.SunRise = parseTime(HR + ":" + MR);

      var TargetTimezoneOffset = (TimeZone * 60 * 60 * 1000) + (retVal.SunRise.getTimezoneOffset() * 60 * 1000);

      var transformedSunRise = new Date(retVal.SunRise.getTime() + TargetTimezoneOffset);

      var strSunRise = transformedSunRise.getHours() + ":" + (transformedSunRise.getMinutes() < 10 ? "0" + transformedSunRise.getMinutes() : transformedSunRise.getMinutes());

      var S1 = 18 - H - (L5 + C2 - C3) / 15;

      var HS = parseInt(S1);

      var MS = parseInt((S1 - HS) * 60);

      retVal.SunSet = parseTime(HS + ":" + MS);

      var transformedSunSet = new Date(retVal.SunSet.getTime() + TargetTimezoneOffset);

      var strSunSet = transformedSunSet.getHours() + ":" + (transformedSunSet.getMinutes() < 10 ? "0" + transformedSunSet.getMinutes() : transformedSunSet.getMinutes());

      retVal.Noon = new Date((retVal.SunRise.getTime() + retVal.SunSet.getTime()) / 2);

      var transformedNoon = new Date(retVal.Noon.getTime() + TargetTimezoneOffset);

      var strNoon = transformedNoon.getHours() + ":" + (transformedNoon.getMinutes() < 10 ? "0" + transformedNoon.getMinutes() : transformedNoon.getMinutes());

    } else {

      if (SC > 1) {

        // str="Sun up all day";

        strSunRise = ".";

        strNoon = ".";

        strSunSet = ".";

        var tDate = new Date();

        // Set Sunset to be in the future ...

        retVal.SunSet = new Date(tDate.getFullYear() + 1, tDate.getMonth(), tDate.getDay(), tDate.getHours());

        // Set Sunrise to be in the past ...

        retVal.SunRise = new Date(tDate.getFullYear() - 1, tDate.getMonth(), tDate.getDay(), tDate.getHours() - 1);

      }

      if (SC < -1) {

        // str="Sun down all day";

        strSunRise = ".";

        strNoon = ".";

        strSunSet = ".";

        // Set Sunrise and Sunset to be in the future ...

        retVal.SunRise = new Date(tDate.getFullYear() + 1, tDate.getMonth(), tDate.getDay(), tDate.getHours());

        retVal.SunSet = new Date(tDate.getFullYear() + 1, tDate.getMonth(), tDate.getDay(), tDate.getHours());

      }

    }

    retVal.strSunRise = strSunRise;

    retVal.strNoon = strNoon;

    retVal.strSunSet = strSunSet;

    retVal.str = "日出" + strSunRise + ' | ' + "正午" + strNoon + ' | ' + "日落" + strSunSet;

    return retVal;

  }

}

ps：非原创，但忘记原文链接了。。。