private static NundinalLetters CheckNundialLetter(LocalDateTime from, LocalDateTime to, NundinalLetters startPosition)
{
var daysFromStart = Math.Abs(to.Minus(new LocalDateTime(from.Year, 1, 1, 0, 0)).Days);
var daysFromCycle = (((daysFromStart + (int)startPosition)) % 8);
return((NundinalLetters)daysFromCycle);
}
private static IEnumerable <NundinalLetters> CheckNundialLetters(LocalDateTime from, NundinalLetters startPosition)
{
var letters = new List <NundinalLetters>
{
CheckNundialLetter(from, new LocalDateTime(from.Year, 1, 1, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 1, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 2, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 3, 7, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 4, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 5, 7, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 6, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 7, 7, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 8, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 9, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 10, 7, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 11, 5, 0, 0), startPosition),
CheckNundialLetter(from, new LocalDateTime(from.Year, 12, 5, 0, 0), startPosition)
};
return(letters);
}