public void Seasons()
{
// 2 min error
const double error = 2.0 / (24 * 60);
// example 26.a
{
double jd = SolarEphem.Season(new Date(1962, 1, 1).ToJulianDay(), Season.Summer);
Assert.AreEqual(2437837.39245, jd, error);
}
{
double jd = SolarEphem.Season(new Date(1991, 1, 1).ToJulianDay(), Season.Spring);
Assert.AreEqual(new Date(new DateTime(1991, 3, 21, 3, 2, 54, DateTimeKind.Utc)).ToJulianEphemerisDay(), jd, error);
}
{
double jd = SolarEphem.Season(new Date(1991, 1, 1).ToJulianDay(), Season.Summer);
Assert.AreEqual(new Date(new DateTime(1991, 6, 21, 21, 19, 46, DateTimeKind.Utc)).ToJulianEphemerisDay(), jd, error);
}
{
double jd = SolarEphem.Season(new Date(1991, 1, 1).ToJulianDay(), Season.Autumn);
Assert.AreEqual(new Date(new DateTime(1991, 9, 23, 12, 49, 04, DateTimeKind.Utc)).ToJulianEphemerisDay(), jd, error);
}
{
double jd = SolarEphem.Season(new Date(1991, 1, 1).ToJulianDay(), Season.Winter);
Assert.AreEqual(new Date(new DateTime(1991, 12, 22, 8, 54, 38, DateTimeKind.Utc)).ToJulianEphemerisDay(), jd, error);
}
}
public ICollection <AstroEvent> EventsSeasons(AstroEventsContext context)
{
List <AstroEvent> events = new List <AstroEvent>();
for (double jd = context.From; jd < context.To; jd += 365)
{
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Spring), Text.Get("SunEvents.Seasons.Spring")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Summer), Text.Get("SunEvents.Seasons.Summer")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Autumn), Text.Get("SunEvents.Seasons.Autumn")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Winter), Text.Get("SunEvents.Seasons.Winter")));
}
return(events);
}
public ICollection <AstroEvent> EventsSeasons(AstroEventsContext context)
{
List <AstroEvent> events = new List <AstroEvent>();
for (double jd = context.From; jd < context.To; jd += 365)
{
// check for cancel
if (context.CancelToken?.IsCancellationRequested == true)
{
return(new AstroEvent[0]);
}
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Spring), Text.Get("SunEvents.Seasons.Spring")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Summer), Text.Get("SunEvents.Seasons.Summer")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Autumn), Text.Get("SunEvents.Seasons.Autumn")));
events.Add(new AstroEvent(SolarEphem.Season(jd, Season.Winter), Text.Get("SunEvents.Seasons.Winter")));
}
return(events);
}
private Date Seasons(SkyContext c, Season s)
{
return(c.GetDate(SolarEphem.Season(c.JulianDay, s)));
}