private static MoonPosition GetMoonPosition(DateTime date, double lat, double lng, Celestial cel)
{
//Set UTC date integrity
date = new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, DateTimeKind.Utc);
double d = JulianConversions.GetJulian_Epoch2000(date);
//Ch 47
double JDE = JulianConversions.GetJulian(date); //Get julian
double T = (JDE - 2451545) / 36525; //Get dynamic time.
double[] LDMNF = Get_Moon_LDMNF(T);
CelCoords c = GetMoonCoords(d, cel, LDMNF, T);
Distance dist = GetMoonDistance(date);
double lw = rad * -lng;
double phi = rad * lat;
double H = rad * Get_Sidereal_Time(JDE, lw) - lw - c.ra;
double ra = c.ra; //Adjust current RA formula to avoid needless RAD conversions
double dec = c.dec; //Adjust current RA formula to avoid needless RAD conversions
//Adjust for parallax (low accuracry increases may not be worth cost)
//Investigate
double pSinE = Get_pSinE(dec, dist.Meters) * Math.PI / 180;
double pCosE = Get_pCosE(dec, dist.Meters) * Math.PI / 180;
double cRA = Parallax_RA(dist.Meters, H, pCosE, dec, ra);
double tDEC = Parallax_Dec(dist.Meters, H, pCosE, pSinE, dec, cRA);
double tRA = ra - cRA;
dec = tDEC;
ra = tRA;
//Get true altitude
double h = altitude(H, phi, dec);
// formula 14.1 of "Astronomical Algorithms" 2nd edition by Jean Meeus (Willmann-Bell, Richmond) 1998.
double pa = Math.Atan2(Math.Sin(H), Math.Tan(phi) * Math.Cos(dec) - Math.Sin(dec) * Math.Cos(H));
//altitude correction for refraction
h = h + astroRefraction(h);
MoonPosition mp = new MoonPosition();
mp.Azimuth = azimuth(H, phi, dec);
mp.Altitude = h / Math.PI * 180;
mp.Distance = dist;
mp.ParallacticAngle = pa;
double horParal = 8.794 / (dist.Meters / 149.59787E6); // horizontal parallax (arcseconds), Meeus S. 263
double p = Math.Asin(Math.Cos(h) * Math.Sin(horParal / 3600)); // parallax in altitude (degrees)
p *= 1000;
mp.ParallaxCorection = p;
mp.Altitude *= rad;
return(mp);
}
public static LunarCoordinates GetMoonCoords(DateTime date, double offset)
{
double julianOffset = offset * .04166667;
//Ch 47
double oJDE = JulianConversions.GetJulian(date) + julianOffset; //Get julian
double T = (oJDE - 2451545) / 36525; //Get dynamic time.
double[] LDMNF = Get_Moon_LDMNF(T);
return(GetMoonCoords(LDMNF, T, oJDE));
}
public static SolarCoordinates Get_Solar_Coordinates(DateTime d, double offset)
{
double julianOffset = offset * .04166667;
double JD = JulianConversions.GetJulian(d) + julianOffset;
double T = (JD - 2451545.0) / 36525; //25.1 Time
double L0 = 280.46646 + 36000.76983 * T + .0003032 * Math.Pow(T, 2); //25.2 Geometric Mean Longitude
double M = 357.52911 + 35999.05029 * T - .0001537 * Math.Pow(T, 2); //25.3 Mean Anomaly
double e = .016708634 - .000042037 * T - .0000001267 * Math.Pow(T, 2); //25.4 Eccentricity
double C = +(1.914602 - .004817 * T - .000014 * Math.Pow(T, 2)) * Math.Sin(M.ToRadians()) +
(.019993 - .000101 * T) * Math.Sin(2 * M.ToRadians()) +
.000289 * Math.Sin(3 * M.ToRadians()); //25.4 Equation of the center
double trueLongitude = L0 + C; //25.4
double trueAnomaly = M + C; //25.4 "v"
double R = (1.000001018 * (1 - Math.Pow(e, 2))) / (1 + e * Math.Cos(trueAnomaly.ToRadians())); //25.5 Radius Vector
double ascendingNode = 125.04 - 1934.136 * T;
double apparentLongitude = trueLongitude - .00569 - .00478 * Math.Sin(ascendingNode.ToRadians());
double E = Format.ToDegrees(23, 26, 21.488) - (46.8150 / 3600) * T - (.00059 / 3600) * Math.Pow(T, 2) + (.001813 / 3600) * Math.Pow(T, 3); //22.2 Obliquity of the ecliptic
double tra = Math.Atan2(Math.Cos(E.ToRadians()) * Math.Sin(trueLongitude.ToRadians()), Math.Cos(trueLongitude.ToRadians())); //25.6 True Right Ascensions. Using Atan2 we can move tan to the right side of the function with Numerator, Denominator
double tdec = Math.Asin(Math.Sin(E.ToRadians()) * Math.Sin(trueLongitude.ToRadians())); //25.7 True declination. Asin used in liu of sin.
double CE = E + .00256 * Math.Cos(ascendingNode.ToRadians()); //22.2 Obliquity of the ecliptic
double ara = Math.Atan2(Math.Cos(CE.ToRadians()) * Math.Sin(apparentLongitude.ToRadians()), Math.Cos(apparentLongitude.ToRadians())); //25.8 Apparent Right Ascensions. Using Atan2 we can move tan to the right side of the function with Numerator, Denominator
double adec = Math.Asin(Math.Sin(CE.ToRadians()) * Math.Sin(apparentLongitude.ToRadians())); //25.8 Apparent declination. Asin used in liu of sin.
SolarCoordinates celC = new SolarCoordinates();
//Set to degrees
//celC.trueRightAscension = tra.ToDegrees();
//celC.trueDeclination = tdec.ToDegrees();
celC.rightAscension = ara.ToDegrees().NormalizeDegrees360();
celC.declination = adec.ToDegrees();
celC.julianDayDecimal = JD - .5 - Math.Floor(JD - .5);
celC.trueLongitude = trueLongitude.NormalizeDegrees360();
celC.longitude = apparentLongitude.NormalizeDegrees360();
celC.radiusVector = R;
celC.geometricMeanLongitude = L0.NormalizeDegrees360();
//Latitude is always 0 for sun as perturbations no accounted for in low accuracy formulas
celC.latitude = 0;
celC.trueLatitude = 0;
return(celC);
}
private static Distance GetMoonDistance(DateTime d, double[] values)
{
//Ch 47
double JDE = JulianConversions.GetJulian(d); //Get julian
double T = (JDE - 2451545) / 36525; //Get dynamic time.
double D = values[1];
double M = values[2];
double N = values[3];
double F = values[4];
double dist = 385000.56 + (MeeusTables.Moon_Periodic_Er(D, M, N, F, T) / 1000);
return(new Distance(dist));
}
/// <summary>
/// Gets moon distance (Ch 47).
/// </summary>
/// <param name="d">DateTime</param>
/// <param name="offset">UTC offset in hours</param>
/// <returns>Distance</returns>
public static Distance GetMoonDistance(DateTime d, double offset)
{
//Ch 47
offset *= -1;
double julianOffset = offset * .04166667;
double JDE = JulianConversions.GetJulian(d) + julianOffset; //Get julian
double T = (JDE - 2451545) / 36525; //Get dynamic time.
double[] values = Get_Moon_LDMNF(T);
double D = values[1];
double M = values[2];
double N = values[3];
double F = values[4];
//Ch 47 distance formula
double dist = 385000.56 + (MeeusTables.Moon_Periodic_Er(D, M, N, F, T) / 1000);
return(new Distance(dist));
}
/// <summary>
/// Gets times for additional solar times
/// </summary>
private static void getTimes(DateTime date, double lng, double lat, Celestial c)
{
//Get Julian
double d = JulianConversions.GetJulian(date) - j2000 + .5; //LESS PRECISE JULIAN NEEDED
double lw = rad * -lng;
double phi = rad * lat;
double n = julianCycle(d, lw);
double ds = approxTransit(0, lw, n);
double M = solarMeanAnomaly(ds);
double L = eclipticLongitude(M);
double dec = declination(L, 0);
double Jnoon = solarTransitJ(ds, M, L);
double Jset;
double Jrise;
DateTime?solarNoon = JulianConversions.GetDate_FromJulian(Jnoon);
DateTime?nadir = JulianConversions.GetDate_FromJulian(Jnoon - 0.5);
c.AdditionalSolarTimes = new AdditionalSolarTimes();
//Dusk and Dawn
Jset = GetTime(-6 * rad, lw, phi, dec, n, M, L);
Jrise = Jnoon - (Jset - Jnoon);
c.AdditionalSolarTimes.CivilDawn = DayMatch(JulianConversions.GetDate_FromJulian(Jrise), date);
c.AdditionalSolarTimes.CivilDusk = DayMatch(JulianConversions.GetDate_FromJulian(Jset), date);
Jset = GetTime(-12 * rad, lw, phi, dec, n, M, L);
Jrise = Jnoon - (Jset - Jnoon);
c.AdditionalSolarTimes.NauticalDawn = DayMatch(JulianConversions.GetDate_FromJulian(Jrise), date);
c.AdditionalSolarTimes.NauticalDusk = DayMatch(JulianConversions.GetDate_FromJulian(Jset), date);
}
/// <summary>
/// Gets time of event based on specified degree below horizon
/// </summary>
/// <param name="lw">Observer Longitude in radians</param>
/// <param name="phi">Observer Latitude in radians</param>
/// <param name="h">Angle in Degrees</param>
/// <param name="date">Date of Event</param>
/// <returns>DateTime?[]{rise, set}</returns>
private static DateTime?[] Get_Event_Time(double lw, double phi, double h, DateTime date)
{
//Create arrays. Index 0 = Day -1, 1 = Day, 2 = Day + 1;
//These will be used to find exact day event occurs for comparison
DateTime?[] sets = new DateTime?[] { null, null, null, null, null };
DateTime?[] rises = new DateTime?[] { null, null, null, null, null };
//Iterate starting with day -1;
for (int x = 0; x < 5; x++)
{
double d = JulianConversions.GetJulian(date.AddDays(x - 2)) - j2000 + .5; //LESS PRECISE JULIAN NEEDED
double n = julianCycle(d, lw);
double ds = approxTransit(0, lw, n);
double M = solarMeanAnomaly(ds);
double L = eclipticLongitude(M);
double dec = declination(L, 0);
double Jnoon = solarTransitJ(ds, M, L);
double Jset;
double Jrise;
DateTime?solarNoon = JulianConversions.GetDate_FromJulian(Jnoon);
DateTime?nadir = JulianConversions.GetDate_FromJulian(Jnoon - 0.5);
//Rise Set
Jset = GetTime(h * rad, lw, phi, dec, n, M, L);
Jrise = Jnoon - (Jset - Jnoon);
DateTime?rise = JulianConversions.GetDate_FromJulian(Jrise);
DateTime?set = JulianConversions.GetDate_FromJulian(Jset);
rises[x] = rise;
sets[x] = set;
}
//Compare and send
DateTime?tRise = null;
for (int x = 0; x < 5; x++)
{
if (rises[x].HasValue)
{
if (rises[x].Value.Day == date.Day)
{
tRise = rises[x];
break;
}
}
}
DateTime?tSet = null;
for (int x = 0; x < 5; x++)
{
if (sets[x].HasValue)
{
if (sets[x].Value.Day == date.Day)
{
tSet = sets[x];
break;
}
}
}
return(new DateTime?[] { tRise, tSet });
}
/// <summary>
/// Gets time of event based on specified degree below specified altitude
/// </summary>
/// <param name="lw">Observer Longitude in radians</param>
/// <param name="phi">Observer Latitude in radians</param>
/// <param name="h">Angle in Degrees</param>
/// <param name="date">Date of Event</param>
/// <param name="offset">Offset hours</param>
/// <param name="calculateNoon">Should solar noon iterate and return value</param>
/// <returns>DateTime?[]{rise, set}</returns>
internal static DateTime?[] Get_Event_Time(double lw, double phi, double h, DateTime date, double offset, bool calculateNoon)
{
double julianOffset = offset * .04166667;
//Create arrays. Index 0 = Day -1, 1 = Day, 2 = Day + 1;
//These will be used to find exact day event occurs for comparison
DateTime?[] sets = new DateTime?[] { null, null, null, null, null };
DateTime?[] rises = new DateTime?[] { null, null, null, null, null };
DateTime?[] solarNoons = new DateTime?[] { null, null, null, null, null };
//Iterate starting with day -1;
for (int x = 0; x < 5; x++)
{
double d = JulianConversions.GetJulian(date.AddDays(x - 2)) - j2000 + .5; //LESS PRECISE JULIAN NEEDED
double n = julianCycle(d, lw);
//var celC = Get_Solar_Coordinates(date); //Change and Test locs!
double ds = approxTransit(0, lw, n);
//M = celC.MeanAnomaly.ToRadians();
double M = solarMeanAnomaly(ds);
double L = eclipticLongitude(M);
double dec = declination(L, 0);
double Jnoon = solarTransitJ(ds, M, L);
//Rise Set
double Jset = GetTime(h * rad, lw, phi, dec, n, M, L);
double Jrise = Jnoon - (Jset - Jnoon);
DateTime?rise = JulianConversions.GetDate_FromJulian(Jrise + julianOffset); //Adjusting julian for DT OFFSET MAY HELP WITH LOCAL TIME
DateTime?set = JulianConversions.GetDate_FromJulian(Jset + julianOffset); //Adjusting julian for DT OFFSET MAY HELP WITH LOCAL TIME
rises[x] = rise;
sets[x] = set;
if (calculateNoon)
{
solarNoons[x] = JulianConversions.GetDate_FromJulian(Jnoon + julianOffset);
}
}
//Compare and send
DateTime?tRise = Get_Event_Target_Date(rises, date);
DateTime?tSet = Get_Event_Target_Date(sets, date);
DateTime?tNoon = null;
if (calculateNoon)
{
tNoon = Get_Event_Target_Date(solarNoons, date);
}
return(new DateTime?[] { tRise, tSet, tNoon });
}
public static void GetMoonIllumination(DateTime date, Celestial c, double lat, double lng, EagerLoad el, double offset)
{
//Moon Illum must be done for both the Moon Name and Phase so either will trigger it to load
if (el.Extensions.Lunar_Cycle || el.Extensions.Zodiac)
{
date = new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, DateTimeKind.Utc);
offset *= -1;
double julianOffset = offset * .04166667;
SolarCoordinates s = SunCalc.Get_Solar_Coordinates(date, offset);
double JDE = JulianConversions.GetJulian(date) + julianOffset; //Get julian
double T = (JDE - 2451545) / 36525; //Get dynamic time.
double[] LDMNF = Get_Moon_LDMNF(T);
LunarCoordinates m = GetMoonCoords(LDMNF, T, JDE);
double sdist = 149598000,
phi = Math.Acos(Math.Sin(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) + Math.Cos(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians())),
inc = Math.Atan2(sdist * Math.Sin(phi), 0 - sdist * Math.Cos(phi)),
angle = Math.Atan2(Math.Cos(s.declination.ToRadians()) * Math.Sin(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()), Math.Sin(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) -
Math.Cos(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()));
MoonIllum mi = new MoonIllum();
mi.Fraction = (1 + Math.Cos(inc)) / 2;
mi.Phase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
mi.Angle = angle;
c.moonIllum = mi;
string moonName = "";
int moonDate = 0;
//GET PHASE NAME
//CHECK MOON AT BEGINNING AT END OF DAY TO GET DAY PHASE
DateTime dMon = new DateTime(date.Year, date.Month, 1);
for (int x = 1; x <= date.Day; x++)
{
DateTime nDate = new DateTime(dMon.Year, dMon.Month, x, 0, 0, 0, DateTimeKind.Utc);
s = SunCalc.Get_Solar_Coordinates(date, offset);
JDE = JulianConversions.GetJulian(nDate) + julianOffset; //Get julian
T = (JDE - 2451545) / 36525; //Get dynamic time.
LDMNF = Get_Moon_LDMNF(T);
m = GetMoonCoords(LDMNF, T, JDE);
phi = Math.Acos(Math.Sin(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) + Math.Cos(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()));
inc = Math.Atan2(sdist * Math.Sin(phi), 0 - sdist * Math.Cos(phi));
angle = Math.Atan2(Math.Cos(s.declination.ToRadians()) * Math.Sin(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()), Math.Sin(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) -
Math.Cos(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()));
double startPhase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
nDate = new DateTime(dMon.Year, dMon.Month, x, 23, 59, 59, DateTimeKind.Utc);
s = SunCalc.Get_Solar_Coordinates(date, offset);
JDE = JulianConversions.GetJulian(nDate) + julianOffset; //Get julian
T = (JDE - 2451545) / 36525; //Get dynamic time.
LDMNF = Get_Moon_LDMNF(T);
m = GetMoonCoords(LDMNF, T, JDE);
phi = Math.Acos(Math.Sin(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) + Math.Cos(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()));
inc = Math.Atan2(sdist * Math.Sin(phi), 0 - sdist * Math.Cos(phi));
angle = Math.Atan2(Math.Cos(s.declination.ToRadians()) * Math.Sin(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()), Math.Sin(s.declination.ToRadians()) * Math.Cos(m.declination.ToRadians()) -
Math.Cos(s.declination.ToRadians()) * Math.Sin(m.declination.ToRadians()) * Math.Cos(s.rightAscension.ToRadians() - m.rightAscension.ToRadians()));
double endPhase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
//Determine Moon Name.
if (startPhase <= .5 && endPhase >= .5)
{
moonDate = x;
moonName = GetMoonName(dMon.Month, moonName);
}
//Get Moon Name (month, string);
//Get Moon Phase Name
if (date.Day == x)
{
if (startPhase > endPhase)
{
mi.PhaseName = "New Moon";
break;
}
if (startPhase <= .25 && endPhase >= .25)
{
mi.PhaseName = "First Quarter";
break;
}
if (startPhase <= .5 && endPhase >= .5)
{
mi.PhaseName = "Full Moon";
break;
}
if (startPhase <= .75 && endPhase >= .75)
{
mi.PhaseName = "Last Quarter";
break;
}
if (startPhase > 0 && startPhase < .25 && endPhase > 0 && endPhase < .25)
{
mi.PhaseName = "Waxing Crescent";
break;
}
if (startPhase > .25 && startPhase < .5 && endPhase > .25 && endPhase < .5)
{
mi.PhaseName = "Waxing Gibbous";
break;
}
if (startPhase > .5 && startPhase < .75 && endPhase > .5 && endPhase < .75)
{
mi.PhaseName = "Waning Gibbous";
break;
}
if (startPhase > .75 && startPhase < 1 && endPhase > .75 && endPhase < 1)
{
mi.PhaseName = "Waning Crescent";
break;
}
}
}
if (date.Day == moonDate)
{
if (el.Extensions.Zodiac)
{
c.AstrologicalSigns.moonName = moonName;
}
}
else
{
if (el.Extensions.Zodiac)
{
c.AstrologicalSigns.moonName = "";
}
}
}
if (el.Extensions.Lunar_Eclipse)
{
CalculateLunarEclipse(date, lat, lng, c);
}
}
public static void CalculateSunTime(double lat, double longi, DateTime date, Celestial c, double offset = 0)
{
if (date.Year == 0001)
{
return;
} //Return if date vaue hasn't been established.
DateTime actualDate = new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, DateTimeKind.Utc);
//Sun Time Calculations
date = new DateTime(date.Year, date.Month, date.Day, 0, 0, 0, DateTimeKind.Utc);
double zone = -(int)Math.Round(TimeZone.CurrentTimeZone.GetUtcOffset(date).TotalSeconds / 3600);
double jd = JulianConversions.GetJulian(date) - 2451545; // Julian day relative to Jan 1.5, 2000
double lon = longi / 360;
double tz = -1 * offset / 24;
double ct = jd / 36525 + 1; // centuries since 1900.0
double t0 = LocalSiderealTimeForTimeZone(lon, jd, tz); // local sidereal time
// get sun position at start of day
jd += tz;
CalculateSunPosition(jd, ct);
double ra0 = mSunPositionInSkyArr[0];
double dec0 = mSunPositionInSkyArr[1];
// get sun position at end of day
jd += 1;
CalculateSunPosition(jd, ct);
double ra1 = mSunPositionInSkyArr[0];
double dec1 = mSunPositionInSkyArr[1];
// make continuous
if (ra1 < ra0)
{
ra1 += 2 * Math.PI;
}
mIsSunrise = false;
mIsSunset = false;
mRightAscentionArr[0] = ra0;
mDecensionArr[0] = dec0;
// check each hour of this day
for (int k = 0; k < 25; k++)
{
mRightAscentionArr[2] = ra0 + (k + 1) * (ra1 - ra0) / 24;
mDecensionArr[2] = dec0 + (k + 1) * (dec1 - dec0) / 24;
mVHzArr[2] = TestHour(k, zone, t0, lat);
// advance to next hour
mRightAscentionArr[0] = mRightAscentionArr[2];
mDecensionArr[0] = mDecensionArr[2];
mVHzArr[0] = mVHzArr[2];
}
//Times returned for 00:00 may create an hour value of 24 which will throw a DateTime Exception.
//Reset to 0 and keep same day month as this library is designed to return same day event in Z day only.
if (mRiseTimeArr[0] >= 24)
{
mRiseTimeArr[0] -= 24;
}
if (mSetTimeArr[0] >= 24)
{
mSetTimeArr[0] -= 24;
}
c.SunRise = new DateTime(date.Year, date.Month, date.Day, mRiseTimeArr[0], mRiseTimeArr[1], 0);
c.SunSet = new DateTime(date.Year, date.Month, date.Day, mSetTimeArr[0], mSetTimeArr[1], 0);
c.SunCondition = CelestialStatus.RiseAndSet;
// neither sunrise nor sunset
if ((!mIsSunrise) && (!mIsSunset))
{
if (mVHzArr[2] < 0)
{
c.SunCondition = CelestialStatus.DownAllDay;
c.SunRise = null;
c.SunSet = null;
// Sun down all day
}
else
{
c.SunCondition = CelestialStatus.UpAllDay;
c.SunRise = null;
c.SunSet = null;
// Sun up all day
}
}
// sunrise or sunset
else
{
if (!mIsSunrise)
{
// No sunrise this date
c.SunCondition = CelestialStatus.NoRise;
c.SunRise = null;
}
else if (!mIsSunset)
{
// No sunset this date
c.SunCondition = CelestialStatus.NoSet;
c.SunSet = null;
}
}
//Azimuth and Altitude
CalculateSunAngle(actualDate, longi, lat, c);
}
public static void GetMoonIllumination(DateTime date, Celestial c, double lat, double lng)
{
date = new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, DateTimeKind.Utc);
double d = JulianConversions.GetJulian_Epoch2000(date);
CelCoords s = GetSunCoords(d);
double JDE = JulianConversions.GetJulian(date); //Get julian
double T = (JDE - 2451545) / 36525; //Get dynamic time.
double[] LDMNF = Get_Moon_LDMNF(T);
CelCoords m = GetMoonCoords(d, c, LDMNF, T);
double sdist = 149598000,
phi = Math.Acos(Math.Sin(s.dec) * Math.Sin(m.dec) + Math.Cos(s.dec) * Math.Cos(m.dec) * Math.Cos(s.ra - m.ra)),
inc = Math.Atan2(sdist * Math.Sin(phi), m.dist - sdist * Math.Cos(phi)),
angle = Math.Atan2(Math.Cos(s.dec) * Math.Sin(s.ra - m.ra), Math.Sin(s.dec) * Math.Cos(m.dec) -
Math.Cos(s.dec) * Math.Sin(m.dec) * Math.Cos(s.ra - m.ra));
MoonIllum mi = new MoonIllum();
mi.Fraction = (1 + Math.Cos(inc)) / 2;
mi.Phase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
mi.Angle = angle;
c.MoonIllum = mi;
string moonName = "";
int moonDate = 0;
//GET PHASE NAME
//CHECK MOON AT BEGINNING AT END OF DAY TO GET DAY PHASE
DateTime dMon = new DateTime(date.Year, date.Month, 1);
for (int x = 1; x <= date.Day; x++)
{
DateTime nDate = new DateTime(dMon.Year, dMon.Month, x, 0, 0, 0, DateTimeKind.Utc);
d = JulianConversions.GetJulian_Epoch2000(nDate);
s = GetSunCoords(d);
JDE = JulianConversions.GetJulian(nDate); //Get julian
T = (JDE - 2451545) / 36525; //Get dynamic time.
LDMNF = Get_Moon_LDMNF(T);
m = GetMoonCoords(d, c, LDMNF, T);
phi = Math.Acos(Math.Sin(s.dec) * Math.Sin(m.dec) + Math.Cos(s.dec) * Math.Cos(m.dec) * Math.Cos(s.ra - m.ra));
inc = Math.Atan2(sdist * Math.Sin(phi), m.dist - sdist * Math.Cos(phi));
angle = Math.Atan2(Math.Cos(s.dec) * Math.Sin(s.ra - m.ra), Math.Sin(s.dec) * Math.Cos(m.dec) -
Math.Cos(s.dec) * Math.Sin(m.dec) * Math.Cos(s.ra - m.ra));
double startPhase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
nDate = new DateTime(dMon.Year, dMon.Month, x, 23, 59, 59, DateTimeKind.Utc);
d = JulianConversions.GetJulian_Epoch2000(nDate);
s = GetSunCoords(d);
JDE = JulianConversions.GetJulian(nDate); //Get julian
T = (JDE - 2451545) / 36525; //Get dynamic time.
LDMNF = Get_Moon_LDMNF(T);
m = GetMoonCoords(d, c, LDMNF, T);
phi = Math.Acos(Math.Sin(s.dec) * Math.Sin(m.dec) + Math.Cos(s.dec) * Math.Cos(m.dec) * Math.Cos(s.ra - m.ra));
inc = Math.Atan2(sdist * Math.Sin(phi), m.dist - sdist * Math.Cos(phi));
angle = Math.Atan2(Math.Cos(s.dec) * Math.Sin(s.ra - m.ra), Math.Sin(s.dec) * Math.Cos(m.dec) -
Math.Cos(s.dec) * Math.Sin(m.dec) * Math.Cos(s.ra - m.ra));
double endPhase = 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI;
//Determine Moon Name.
if (startPhase <= .5 && endPhase >= .5)
{
moonDate = x;
moonName = GetMoonName(dMon.Month, moonName);
}
//Get Moon Name (month, string);
//Get Moon Phase Name
if (date.Day == x)
{
if (startPhase > endPhase)
{
mi.PhaseName = "New Moon";
break;
}
if (startPhase <= .25 && endPhase >= .25)
{
mi.PhaseName = "First Quarter";
break;
}
if (startPhase <= .5 && endPhase >= .5)
{
mi.PhaseName = "Full Moon";
break;
}
if (startPhase <= .75 && endPhase >= .75)
{
mi.PhaseName = "Last Quarter";
break;
}
if (startPhase > 0 && startPhase < .25 && endPhase > 0 && endPhase < .25)
{
mi.PhaseName = "Waxing Crescent";
break;
}
if (startPhase > .25 && startPhase < .5 && endPhase > .25 && endPhase < .5)
{
mi.PhaseName = "Waxing Gibbous";
break;
}
if (startPhase > .5 && startPhase < .75 && endPhase > .5 && endPhase < .75)
{
mi.PhaseName = "Waning Gibbous";
break;
}
if (startPhase > .75 && startPhase < 1 && endPhase > .75 && endPhase < 1)
{
mi.PhaseName = "Waning Crescent";
break;
}
}
}
if (date.Day == moonDate)
{
c.AstrologicalSigns.MoonName = moonName;
}
else
{
c.AstrologicalSigns.MoonName = "";
}
CalculateLunarEclipse(date, lat, lng, c);
}