/// <summary>
/// Calculate prayer time for isha.
/// </summary>
private static double ComputeIshaTime(double jd, double ishaParameterValue, double latitude)
{
var dayFraction = AstronomyMath.GetDayFraction(IshaDefaultTime);
var ishaTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, ishaParameterValue, latitude, Direction.Clockwise);
return(ishaTime);
}
/// <summary>
/// Calculate prayer time for maghrib.
/// </summary>
private static double ComputeMaghribTime(double jd, double maghribParameterValue, double latitude)
{
var dayFraction = AstronomyMath.GetDayFraction(MaghribDefaultTime);
var maghribTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, maghribParameterValue, latitude, Direction.Clockwise);
return(maghribTime);
}
// /// <summary>
// /// Calculate prayer time for imsak.
// /// </summary>
// // NOTE: Do imsak time can be calculated using angle parameter?
// private static double ComputeImsakTime(double jd, double imsakParameterValue, double latitude)
// {
// var dayFraction = AstronomyMath.GetDayFraction(ImsakDefaultTime);
// var imsakTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, imsakParameterValue, latitude, Direction.CounterClockwise);
//
// return imsakTime;
// }
/// <summary>
/// Calculate prayer time for fajr.
/// </summary>
private static double ComputeFajrTime(double jd, double fajrParameterValue, double latitude)
{
var dayFraction = AstronomyMath.GetDayFraction(FajrDefaultTime);
var fajrTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, fajrParameterValue, latitude, Direction.CounterClockwise);
return(fajrTime);
}
/// <summary>
/// Calculate prayer time for sunset.
/// </summary>
private static double ComputeSunsetTime(double jd, double latitude, double altitude)
{
var dayFraction = AstronomyMath.GetDayFraction(SunsetDefaultTime);
var sunriseAngle = AstronomyMath.ComputeSunriseAngle(altitude);
var sunsetTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, sunriseAngle, latitude, Direction.Clockwise);
return(sunsetTime);
}
/// <summary>
/// Calculate prayer time for asr.
/// </summary>
private static double ComputeAsrTime(double jd, int juristicTimeOfShadow, double latitude)
{
var dayFraction = AstronomyMath.GetDayFraction(AsrDefaultTime);
var sunDeclination = AstronomyMath.ComputeSunDeclination(jd + dayFraction);
var angle = -AngleMath.InverseCotangentInDegree(juristicTimeOfShadow + AngleMath.TangentOfDegree(Math.Abs(latitude - sunDeclination)));
var asrTime = AstronomyMath.ComputeSolarTime(jd, dayFraction, angle, latitude, Direction.Clockwise);
return(asrTime);
}
// ReSharper disable once InconsistentNaming
public void TestComputeSolarTimeForFajrPrayerOnApril12th2018()
{
var st = AstronomyMath.ComputeSolarTime(Jd, 0.20833333333333334, FajrAngle, Latitude, Direction.CounterClockwise);
Assert.Equal(4.644572520441736, st);
}
// ReSharper disable once InconsistentNaming
public void TestComputeSolarTimeForIshaPrayerOnApril12th2018()
{
var st = AstronomyMath.ComputeSolarTime(Jd, 0.75, IshaAngle, Latitude, Direction.Clockwise);
Assert.Equal(19.250576300230424, st);
}