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solcalc.html
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var k = (isLeapYear(year) ? 1 : 2);
var doy = Math.floor((275 * month)/9) - k * Math.floor((month + 9)/12) + day -30;
return doy;
}
function radToDeg(angleRad)
{
return (180.0 * angleRad / Math.PI);
}
function degToRad(angleDeg)
{
return (Math.PI * angleDeg / 180.0);
}
function calcGeomMeanLongSun(t)
{
var L0 = 280.46646 + t * (36000.76983 + t*(0.0003032))
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(HAarg);
return HA; // in radians (for sunset, use -HA)
}
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 zeroPad(n, digits) {
n = n.toString();
while (n.length < digits) {
n = '0' + n;
}
return n;
}
function readTextBox(inputId, numchars, intgr, pad, min, max, def)
{
var number = document.getElementById(inputId).value.substring(0,numchars)
if (intgr) {
number = Math.floor(parseFloat(number))
} else { // float
number = parseFloat(number)
}
if (number < min) {
number = min
} else if (number > max) {
number = max
} else if (number.toString() == "NaN") {
number = def
}
if ((pad) && (intgr)) {
document.getElementById(inputId).value = zeroPad(number,2)
} else {
document.getElementById(inputId).value = number
}
return number
}
function month(name, numdays, abbr)
{
this.name = name;
this.numdays = numdays;
this.abbr = abbr;
}
var monthList = new Array();
var i = 0;
monthList[i++] = new month("January", 31, "Jan");
monthList[i++] = new month("February", 28, "Feb");
monthList[i++] = new month("March", 31, "Mar");
monthList[i++] = new month("April", 30, "Apr");
monthList[i++] = new month("May", 31, "May");
monthList[i++] = new month("June", 30, "Jun");
monthList[i++] = new month("July", 31, "Jul");
monthList[i++] = new month("August", 31, "Aug");
monthList[i++] = new month("September", 30, "Sep");
monthList[i++] = new month("October", 31, "Oct");
monthList[i++] = new month("November", 30, "Nov");
monthList[i++] = new month("December", 31, "Dec");
function getJD()
{
var docmonth = document.getElementById("mosbox").selectedIndex + 1
var docday = document.getElementById("daybox").selectedIndex + 1
var docyear = readTextBox("yearbox", 5, 1, 0, -2000, 3000, 2009)
if ( (isLeapYear(docyear)) && (docmonth == 2) ) {
if (docday > 29) {
docday = 29
document.getElementById("daybox").selectedIndex = docday - 1
}
} else {
if (docday > monthList[docmonth-1].numdays) {
docday = monthList[docmonth-1].numdays
document.getElementById("daybox").selectedIndex = docday - 1
}
}
if (docmonth <= 2) {
docyear -= 1
docmonth += 12
}
var A = Math.floor(docyear/100)
var B = 2 - A + Math.floor(A/4)
var JD = Math.floor(365.25*(docyear + 4716)) + Math.floor(30.6001*(docmonth+1)) + docday + B - 1524.5
return JD
}
function getTimeLocal()
{
var dochr = readTextBox("hrbox", 2, 1, 1, 0, 23, 12)
var docmn = readTextBox("mnbox", 2, 1, 1, 0, 59, 0)
var docsc = readTextBox("scbox", 2, 1, 1, 0, 59, 0)
var docpm = document.getElementById("pmbox").checked
var docdst = document.getElementById("dstCheckbox").checked
if ( (docpm) && (dochr < 12) ) {
dochr += 12
}
if (docdst) {
dochr -= 1
}
var mins = dochr * 60 + docmn + docsc/60.0
return mins
}
function calcAzEl(output, T, localtime, latitude, longitude, zone)
{
var eqTime = calcEquationOfTime(T)
var theta = calcSunDeclination(T)
if (output) {
document.getElementById("eqtbox").value = Math.floor(eqTime*100 +0.5)/100.0
document.getElementById("sdbox").value = Math.floor(theta*100+0.5)/100.0
}
var solarTimeFix = eqTime + 4.0 * longitude - 60.0 * zone
var earthRadVec = calcSunRadVector(T)
var trueSolarTime = localtime + solarTimeFix
while (trueSolarTime > 1440)
{
trueSolarTime -= 1440
}
var hourAngle = trueSolarTime / 4.0 - 180.0;
if (hourAngle < -180)
{
hourAngle += 360.0
}
var haRad = degToRad(hourAngle)
var csz = Math.sin(degToRad(latitude)) * Math.sin(degToRad(theta)) + Math.cos(degToRad(latitude)) * Math.cos(degToRad(theta)) * Math.cos(haRad)
if (csz > 1.0)
{
csz = 1.0
} else if (csz < -1.0)
{
csz = -1.0
}
var zenith = radToDeg(Math.acos(csz))
var azDenom = ( Math.cos(degToRad(latitude)) * Math.sin(degToRad(zenith)) )
if (Math.abs(azDenom) > 0.001) {
azRad = (( Math.sin(degToRad(latitude)) * Math.cos(degToRad(zenith)) ) - Math.sin(degToRad(theta))) / azDenom
if (Math.abs(azRad) > 1.0) {
if (azRad < 0) {
azRad = -1.0
} else {
azRad = 1.0
}
}
var azimuth = 180.0 - radToDeg(Math.acos(azRad))
if (hourAngle > 0.0) {
azimuth = -azimuth
}
} else {
if (latitude > 0.0) {
azimuth = 180.0
} else {
azimuth = 0.0
}
}
if (azimuth < 0.0) {
azimuth += 360.0
}
var exoatmElevation = 90.0 - zenith
// Atmospheric Refraction correction
if (exoatmElevation > 85.0) {
var refractionCorrection = 0.0;
} else {
var te = Math.tan (degToRad(exoatmElevation));
if (exoatmElevation > 5.0) {
var refractionCorrection = 58.1 / te - 0.07 / (te*te*te) + 0.000086 / (te*te*te*te*te);
} else if (exoatmElevation > -0.575) {
var refractionCorrection = 1735.0 + exoatmElevation * (-518.2 + exoatmElevation * (103.4 + exoatmElevation * (-12.79 + exoatmElevation * 0.711) ) );
} else {
var refractionCorrection = -20.774 / te;
}
refractionCorrection = refractionCorrection / 3600.0;
}
var solarZen = zenith - refractionCorrection;
if ((output) && (solarZen > 108.0) ) {
document.getElementById("azbox").value = "dark"
document.getElementById("elbox").value = "dark"
} else if (output) {
document.getElementById("azbox").value = Math.floor(azimuth*100 +0.5)/100.0
document.getElementById("elbox").value = Math.floor((90.0-solarZen)*100+0.5)/100.0
if (document.getElementById("showae").checked) {
showLineGeodesic("#ffff00", azimuth)
}
}
return (azimuth)
}
function calcSolNoon(jd, longitude, timezone, dst)
{
var tnoon = calcTimeJulianCent(jd - longitude/360.0)
var eqTime = calcEquationOfTime(tnoon)
var solNoonOffset = 720.0 - (longitude * 4) - eqTime // in minutes
var newt = calcTimeJulianCent(jd + solNoonOffset/1440.0)
eqTime = calcEquationOfTime(newt)
solNoonLocal = 720 - (longitude * 4) - eqTime + (timezone*60.0)// in minutes
if(dst) solNoonLocal += 60.0
document.getElementById("noonbox").value = timeString(solNoonLocal, 3)
}
function dayString(jd, next, flag)
{
// returns a string in the form DDMMMYYYY[ next] to display prev/next rise/set
// flag=2 for DD MMM, 3 for DD MM YYYY, 4 for DDMMYYYY next/prev
if ( (jd < 900000) || (jd > 2817000) ) {
var output = "error"
} else {
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);
if (flag == 2)
var output = zeroPad(day,2) + " " + monthList[month-1].abbr;
if (flag == 3)
var output = zeroPad(day,2) + monthList[month-1].abbr + year.toString();
if (flag == 4)
var output = zeroPad(day,2) + monthList[month-1].abbr + year.toString() + ((next) ? " next" : " prev");
}
return output;
}
function timeDateString(JD, minutes)
{
var output = timeString(minutes, 2) + " " + dayString(JD, 0, 2);
return output;
}
function timeString(minutes, flag)
// timeString returns a zero-padded string (HH:MM:SS) given time in minutes
// flag=2 for HH:MM, 3 for HH:MM:SS
{
if ( (minutes >= 0) && (minutes < 1440) ) {
var floatHour = minutes / 60.0;
var hour = Math.floor(floatHour);
var floatMinute = 60.0 * (floatHour - Math.floor(floatHour));
var minute = Math.floor(floatMinute);
var floatSec = 60.0 * (floatMinute - Math.floor(floatMinute));
var second = Math.floor(floatSec + 0.5);
if (second > 59) {
second = 0
minute += 1
}
if ((flag == 2) && (second >= 30)) minute++;
if (minute > 59) {
minute = 0
hour += 1
}
var output = zeroPad(hour,2) + ":" + zeroPad(minute,2);
if (flag > 2) output = output + ":" + zeroPad(second,2);
} else {
var output = "error"
}
return output;
}
function calcSunriseSetUTC(rise, JD, latitude, longitude)
{
var t = calcTimeJulianCent(JD);
var eqTime = calcEquationOfTime(t);
var solarDec = calcSunDeclination(t);
var hourAngle = calcHourAngleSunrise(latitude, solarDec);
//alert("HA = " + radToDeg(hourAngle));
if (!rise) hourAngle = -hourAngle;
var delta = longitude + radToDeg(hourAngle);
var timeUTC = 720 - (4.0 * delta) - eqTime; // in minutes
return timeUTC
}
function calcSunriseSet(rise, JD, latitude, longitude, timezone, dst)
// rise = 1 for sunrise, 0 for sunset
{
var id = ((rise) ? "risebox" : "setbox")
var timeUTC = calcSunriseSetUTC(rise, JD, latitude, longitude);
var newTimeUTC = calcSunriseSetUTC(rise, JD + timeUTC/1440.0, latitude, longitude);
if (isNumber(newTimeUTC)) {
var timeLocal = newTimeUTC + (timezone * 60.0)
if (document.getElementById(rise ? "showsr" : "showss").checked) {
var riseT = calcTimeJulianCent(JD + newTimeUTC/1440.0)
var riseAz = calcAzEl(0, riseT, timeLocal, latitude, longitude, timezone)
showLineGeodesic(rise ? "#66ff00" : "#ff0000", riseAz)
}
timeLocal += ((dst) ? 60.0 : 0.0);
if ( (timeLocal >= 0.0) && (timeLocal < 1440.0) ) {
document.getElementById(id).value = timeString(timeLocal,2)
} else {
var jday = JD
var increment = ((timeLocal < 0) ? 1 : -1)
while ((timeLocal < 0.0)||(timeLocal >= 1440.0)) {
timeLocal += increment * 1440.0
jday -= increment
}
document.getElementById(id).value = timeDateString(jday,timeLocal)
}
} else { // no sunrise/set found
var doy = calcDoyFromJD(JD)
if ( ((latitude > 66.4) && (doy > 79) && (doy < 267)) ||
((latitude < -66.4) && ((doy < 83) || (doy > 263))) )
{ //previous sunrise/next sunset
if (rise) { // find previous sunrise
jdy = calcJDofNextPrevRiseSet(0, rise, JD, latitude, longitude, timezone, dst)
} else { // find next sunset
jdy = calcJDofNextPrevRiseSet(1, rise, JD, latitude, longitude, timezone, dst)
}
document.getElementById(((rise)? "risebox":"setbox")).value = dayString(jdy,0,3)
} else { //previous sunset/next sunrise
if (rise == 1) { // find previous sunrise
jdy = calcJDofNextPrevRiseSet(1, rise, JD, latitude, longitude, timezone, dst)
} else { // find next sunset
jdy = calcJDofNextPrevRiseSet(0, rise, JD, latitude, longitude, timezone, dst)
}
document.getElementById(((rise)? "risebox":"setbox")).value = dayString(jdy,0,3)
}
}
}
function calcJDofNextPrevRiseSet(next, rise, JD, latitude, longitude, tz, dst)
{
var julianday = JD;
var increment = ((next) ? 1.0 : -1.0);
var time = calcSunriseSetUTC(rise, julianday, latitude, longitude);
while(!isNumber(time)){
julianday += increment;
time = calcSunriseSetUTC(rise, julianday, latitude, longitude);
}
var timeLocal = time + tz * 60.0 + ((dst) ? 60.0 : 0.0)
while ((timeLocal < 0.0) || (timeLocal >= 1440.0))
{
var incr = ((timeLocal < 0) ? 1 : -1)
timeLocal += (incr * 1440.0)
julianday -= incr
}
return julianday;
}
function clearOutputs()
{
document.getElementById("eqtbox").value = ""
document.getElementById("sdbox").value = ""
document.getElementById("risebox").value = ""
document.getElementById("noonbox").value = ""
document.getElementById("setbox").value = ""
document.getElementById("azbox").value = ""
document.getElementById("elbox").value = ""
}
function calculate() {
//refreshMap()
//clearOutputs()
//map.clearOverlays()
//showMarkers()
var jday = getJD()
var tl = getTimeLocal()
var tz = readTextBox("zonebox", 5, 0, 0, -14, 13, 0)
var dst = document.getElementById("dstCheckbox").checked
var total = jday + tl/1440.0 - tz/24.0
var T = calcTimeJulianCent(total)
var lat = parseFloat(document.getElementById("latbox").value.substring(0,9))
var lng = parseFloat(document.getElementById("lngbox").value.substring(0,10))
calcAzEl(1, T, tl, lat, lng, tz)
calcSolNoon(jday, lng, tz, dst)
var rise = calcSunriseSet(1, jday, lat, lng, tz, dst)
var set = calcSunriseSet(0, jday, lat, lng, tz, dst)
//alert("JD " + jday + " " + rise + " " + set + " ")
}
</SCRIPT>
</head>
<body onload="load()" onunload="GUnload()">
<TABLE cellpadding="2">
<TR><TD align="center">
<FORM NAME="showpins" action="">
<TABLE cellpadding="0">
<TR><TH>
Show:
</TH><TD>
<FONT size="2" color="purple">
<INPUT TYPE="radio" NAME="showpins" ID="showworld" VALUE="World" onClick="refreshMap()">World Cities
</TD><TD>
<FONT size="2" color="blue">
<INPUT TYPE="radio" NAME="showpins" ID="showus" VALUE="US" CHECKED onClick="refreshMap()">U.S. Cities
</TD><TD>
<FONT size="2" color="gray">
<INPUT TYPE="radio" NAME="showpins" ID="showobs" VALUE="Obs" onClick="refreshMap()">GMD Observ.'s
</TD><TD>
<FONT size="2" color="green">
<INPUT TYPE="radio" NAME="showpins" ID="showdata" VALUE="Data" onClick="refreshMap()">GMD Data Sites
</TD><TD>
<FONT size="2" color="red">
<INPUT TYPE="radio" NAME="showpins" ID="showsurf" VALUE="Surf" onClick="refreshMap()">SurfRad
</TD></TR>
<TR><TD colspan="6">
<font size="1">
Click one of the small pins near (and in the same time zone as) your desired location. Use the control on the left side of the map to zoom in or out. Place the large pin in the exact desired location. You can use the Save button to have your computer remember the current location for next time. Check the DST check box if Daylight Saving Time is in effect for your site.
</font>
</TD></TR>
</TABLE>
</TD></TR>
<TR><TD align="center">
<div id='map' style='width: 600px; height: 450px; '></div>
</TD></TR>
<TR><TD align="center">
<TABLE border="2" cellpadding="2" width="630">
<TR>
<TH>Location:</TH>
<TD>
<a href="glossary.html#latitude" target="_blank">Lat</a>
<SCRIPT type="text/javascript">
var cookee = GetCookie("lat");
var lat = (cookee) ? cookee : "39.833";
document.writeln("<INPUT TYPE=\"text\" NAME=\"lat\" id=\"latbox\" SIZE=\"5\" VALUE=\"" + lat + "\" class=\"textinput\" onChange=\"latlongChanged()\">");
</SCRIPT>
</TD><TD>
<a href="glossary.html#longitude" target="_blank">Lng</a>
<SCRIPT LANGUAGE="JavaScript" type="text/javascript">
var cookee = GetCookie("lng");
var lon = (cookee) ? cookee : "-98.583";
document.writeln("<INPUT TYPE=\"text\" NAME=\"lon\" id=\"lngbox\" SIZE=\"8\" VALUE=\"" + lon + "\" class=\"textinput\" onChange=\"latlongChanged()\">");
</SCRIPT>
</TD><TD>
<a href="timezone.html" target="_blank">Time Zone</a>
<SCRIPT LANGUAGE="JavaScript" type="text/javascript">
var cookee = GetCookie("gmt");
var gmt = (cookee) ? cookee : "-6";
document.writeln("<INPUT TYPE=\"text\" NAME=\"timezone\" id=\"zonebox\" SIZE=\"3\" VALUE=\"" + gmt + "\" class=\"textinput\" onKeyPress=\"clearOutputs()\" onChange=\"inputsChanged()\">");
</SCRIPT>
</TD><TD>
<a href="glossary.html#daylightsavingtime" target="_blank">DST?</a> <INPUT TYPE="checkbox" NAME="dst" ID="dstCheckbox" onClick="inputsChanged()">
</TD><TD>
<INPUT TYPE="button" NAME="mkCookie" VALUE="Save" onClick="saveCookie()">