public static AAS2DCoordinate MoonPosition(DateTime dateTime)
{
dateTime = dateTime.ToUniversalTime(); // NOTE: time must be converted to Universal Time
//Calculate the topocentric horizontal position of the Moon
AASDate dateMoonCalc = new AASDate(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute, dateTime.Second, true);
double JDMoon = dateMoonCalc.Julian + AASDynamicalTime.DeltaT(dateMoonCalc.Julian) / 86400.0;
double MoonLong = AASMoon.EclipticLongitude(JDMoon);
double MoonLat = AASMoon.EclipticLatitude(JDMoon);
AAS2DCoordinate Equatorial = AASCoordinateTransformation.Ecliptic2Equatorial(MoonLong, MoonLat, AASNutation.TrueObliquityOfEcliptic(JDMoon));
double MoonRad = AASMoon.RadiusVector(JDMoon);
MoonRad /= 149597870.691; //Convert KM to AU
AAS2DCoordinate MoonTopo = AASParallax.Equatorial2Topocentric(Equatorial.X, Equatorial.Y, MoonRad, RT_LONG, RT_LAT, RT_HEIGHT, JDMoon);
double AST = AASSidereal.ApparentGreenwichSiderealTime(dateMoonCalc.Julian);
double LongtitudeAsHourAngle = AASCoordinateTransformation.DegreesToHours(RT_LONG);
double LocalHourAngle = AST - LongtitudeAsHourAngle - MoonTopo.X;
AAS2DCoordinate MoonHorizontal = AASCoordinateTransformation.Equatorial2Horizontal(LocalHourAngle, MoonTopo.Y, RT_LAT);
MoonHorizontal.Y += AASRefraction.RefractionFromTrue(MoonHorizontal.Y, 1013, 10);
//The result above should be that we have a rising Moon at Y degrees above the horizon at azimuth X degrees east of the southern horizon
//NOTE: for azimuth west is considered positive, to get east as positive subtract the result from 360
return(MoonHorizontal);
}
public static AAS2DCoordinate SunPosition(DateTime dateTime)
{
var bHighPrecision = false;
dateTime = dateTime.ToUniversalTime(); // NOTE: time must be converted to Universal Time
//Calculate the topocentric horizontal position of the Sun
AASDate dateSunCalc = new AASDate(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute, dateTime.Second, true);
double JDSun = dateSunCalc.Julian + AASDynamicalTime.DeltaT(dateSunCalc.Julian) / 86400.0;
double SunLong = AASSun.ApparentEclipticLongitude(JDSun, bHighPrecision);
double SunLat = AASSun.ApparentEclipticLatitude(JDSun, bHighPrecision);
AAS2DCoordinate Equatorial = AASCoordinateTransformation.Ecliptic2Equatorial(SunLong, SunLat, AASNutation.TrueObliquityOfEcliptic(JDSun));
double SunRad = AASEarth.RadiusVector(JDSun, bHighPrecision);
AAS2DCoordinate SunTopo = AASParallax.Equatorial2Topocentric(Equatorial.X, Equatorial.Y, SunRad, RT_LONG, RT_LAT, RT_HEIGHT, JDSun);
double AST = AASSidereal.ApparentGreenwichSiderealTime(dateSunCalc.Julian);
double LongtitudeAsHourAngle = AASCoordinateTransformation.DegreesToHours(RT_LONG);
double LocalHourAngle = AST - LongtitudeAsHourAngle - SunTopo.X;
AAS2DCoordinate SunHorizontal = AASCoordinateTransformation.Equatorial2Horizontal(LocalHourAngle, SunTopo.Y, RT_LAT);
SunHorizontal.Y += AASRefraction.RefractionFromTrue(SunHorizontal.Y, 1013, 10);
//The result above should be that we have a setting Sun at Y degrees above the horizon at azimuth X degrees south of the westerly horizon
//NOTE: for azimuth west is considered positive, to get east as positive subtract the result from 360
return(SunHorizontal);
}
public void Equatorial2TopocentricTest(double alpha, double delta, double distance, double longitude, double latitude, double height, double jd, double expectedX, double expectedY)
{
AAS2DCoordinate topocentricDelta = AASParallax.Equatorial2Topocentric(alpha, delta, distance, longitude, latitude, height, jd);
Assert.Equal(expectedX, topocentricDelta.X);
Assert.Equal(expectedY, topocentricDelta.Y);
}
public Coordinate GetSunCoordinate(DateTime datetime)
{
AASDate date = new AASDate(datetime.Year, datetime.Month, datetime.Day, datetime.Hour, datetime.Minute, datetime.Second, true);
double JD = date.Julian + AASDynamicalTime.DeltaT(date.Julian) / 86400.0;
double SunLong = AASSun.ApparentEclipticLongitude(JD, false);
double SunLat = AASSun.ApparentEclipticLatitude(JD, false);
AAS2DCoordinate equatorial = AASCoordinateTransformation.Ecliptic2Equatorial(SunLong, SunLat, AASNutation.TrueObliquityOfEcliptic(JD));
double SunRad = AASEarth.RadiusVector(JD, false);
// This line gives us RA & Declination.
AAS2DCoordinate SunTopo = AASParallax.Equatorial2Topocentric(equatorial.X, equatorial.Y, SunRad, Location.Longitude, Location.Latitude, Location.Altitude, JD);
return(new Coordinate(SunTopo.X, SunTopo.Y));
}
public Coordinate GetMoonCoordinate(DateTime datetime)
{
AASDate date = new AASDate(datetime.Year, datetime.Month, datetime.Day, datetime.Hour, datetime.Minute, datetime.Second, true);
double JD = date.Julian + AASDynamicalTime.DeltaT(date.Julian) / 86400.0;
double MoonLong = AASMoon.EclipticLongitude(JD);
double MoonLat = AASMoon.EclipticLatitude(JD);
AAS2DCoordinate Equatorial = AASCoordinateTransformation.Ecliptic2Equatorial(MoonLong, MoonLat, AASNutation.TrueObliquityOfEcliptic(JD));
double MoonRad = AASMoon.RadiusVector(JD);
MoonRad /= 149597870.691; //Convert KM to AU
AAS2DCoordinate MoonTopo = AASParallax.Equatorial2Topocentric(Equatorial.X, Equatorial.Y, MoonRad, Location.Longitude, Location.Latitude, Location.Altitude, JD);
return(new Coordinate(MoonTopo.X, MoonTopo.Y));
}