/// <summary>
/// Adjust calculated prayer time to high latitude adjustment.
/// </summary>
private static double AdjustForHighLatitude(HighLatitudeAdjustment method, double time, double baseTime, double angle, double diff, Direction direction)
{
// Compute night fraction and duration.
var nightFraction = AstronomyMath.GetNightFraction(method, angle, diff);
var duration = direction == Direction.Clockwise
? DateTimeMath.ComputeDuration(time, baseTime)
: DateTimeMath.ComputeDuration(baseTime, time);
// Copy reference;
var newTime = time;
if (duration > nightFraction)
{
var adjustment = direction == Direction.Clockwise ? nightFraction : -nightFraction;
newTime = baseTime + adjustment;
}
return(newTime);
}
public void TestGetNightFractionForHighLatitudeAdjustmentOfAngleBased()
{
Assert.Equal(3.9474849041733533, AstronomyMath.GetNightFraction(HighLatitudeAdjustment.AngleBased, FajrAngle, Diff));
}
public void TestGetNightFractionForHighLatitudeAdjustmentOfOneSeventhOfNight()
{
Assert.Equal(1.691779244645723, AstronomyMath.GetNightFraction(HighLatitudeAdjustment.OneSeventhOfNight, FajrAngle, Diff));
}
public void TestGetNightFractionForHighLatitudeAdjustmentOfMiddleOfNight()
{
Assert.Equal(5.92122735626003, AstronomyMath.GetNightFraction(HighLatitudeAdjustment.MiddleOfNight, FajrAngle, Diff));
}
public void TestGetNightFractionForHighLatitudeAdjustmentOfNoneShouldThrow()
{
Assert.Throws <ArgumentOutOfRangeException>(() => AstronomyMath.GetNightFraction(HighLatitudeAdjustment.None, FajrAngle, Diff));
}