private static Tuple <NOVAS.SkyPosition, NOVAS.SkyPosition> GetMoonAndSunPosition(DateTime date, double jd)
{
var deltaT = DeltaT(date);
var obs = new NOVAS.Observer()
{
OnSurf = new NOVAS.OnSurface()
{
},
Where = (short)NOVAS.ObserverLocation.EarthGeoCenter
};
var moon = new NOVAS.CelestialObject()
{
Name = "Moon",
Number = (short)NOVAS.Body.Moon,
Star = new NOVAS.CatalogueEntry(),
Type = (short)NOVAS.ObjectType.MajorPlanetSunOrMoon
};
var moonPosition = new NOVAS.SkyPosition();
var jdTt = jd + SecondsToDays(deltaT);
var err = NOVAS.Place(jdTt, moon, obs, deltaT, NOVAS.CoordinateSystem.EquinoxOfDate, NOVAS.Accuracy.Full, ref moonPosition);
var sun = new NOVAS.CelestialObject()
{
Name = "Sun",
Number = (short)NOVAS.Body.Sun,
Star = new NOVAS.CatalogueEntry(),
Type = (short)NOVAS.ObjectType.MajorPlanetSunOrMoon
};
var sunPosition = new NOVAS.SkyPosition();
NOVAS.Place(jdTt, sun, obs, deltaT, NOVAS.CoordinateSystem.EquinoxOfDate, NOVAS.Accuracy.Full, ref sunPosition);
return(new Tuple <NOVAS.SkyPosition, NOVAS.SkyPosition>(moonPosition, sunPosition));
}
public Task Calculate()
{
return(Task.Run(() => {
var jd = Astrometry.GetJulianDate(Date);
var deltaT = Astrometry.DeltaT(Date);
var location = new NOVAS.OnSurface()
{
Latitude = Latitude,
Longitude = Longitude
};
var observer = new NOVAS.Observer()
{
OnSurf = location,
Where = (short)NOVAS.ObserverLocation.EarthGeoCenter
};
var obj = new NOVAS.CelestialObject()
{
Name = Name,
Number = (short)BodyNumber,
Star = new NOVAS.CatalogueEntry(),
Type = (short)NOVAS.ObjectType.MajorPlanetSunOrMoon
};
var objPosition = new NOVAS.SkyPosition();
NOVAS.Place(jd + Astrometry.SecondsToDays(deltaT), obj, observer, deltaT, NOVAS.CoordinateSystem.EquinoxOfDate, NOVAS.Accuracy.Full, ref objPosition);
this.Distance = Astrometry.AUToKilometer(objPosition.Dis);
var siderealTime = Astrometry.GetLocalSiderealTime(Date, Longitude);
var hourAngle = Astrometry.HoursToDegrees(Astrometry.GetHourAngle(siderealTime, objPosition.RA));
this.Altitude = Astrometry.GetAltitude(hourAngle, Latitude, objPosition.Dec);
}));
}
