/// <summary>
/// Calculate prayer time for zuhr.
/// </summary>
private static double ComputeZuhrTime(double jd)
{
var dayFraction = AstronomyMath.GetDayFraction(ZuhrDefaultTime);
var midDay = AstronomyMath.ComputeMidDay(jd, dayFraction);
// The fiqh method which states that zuhr is when the sun's disk comes out
// of its zenith line, which is a line between the observer and the center
// of the sun when it is at the highest point is used here. Thus,
// additional 65 seconds is added to the mid day time, which corresponds
// to the formula t = arctan(r/d) / 2π × 24 × 60 × 60, where r is the
// radius of the sun (r = 695,000km), d is the sun-earth distance
// (d = 147,098,074km at minimum and d = 152,097,701km at maximum).
// When, d is at maximum, t evaluates to ~62 seconds and ~65 seconds when
// d is at minimum. Converting 65 seconds to hour yields a value of
// 0.018055555555555554.
var zuhrTime = midDay + 0.018055555555555554;
return(zuhrTime);
}
// ReSharper disable once InconsistentNaming
public void TestComputeMidDayOnApril12th2018()
{
var mid = AstronomyMath.ComputeMidDay(Jd, 0.5);
Assert.Equal(12.014588571149947, mid);
}
