/// <summary>
/// return true if ta is before tb (eveluates (ta less than tb)
/// </summary>
/// <param name="ta">Time ta</param>
/// <param name="tb">time tb</param>
/// <returns>true if ta is before tb (eveluates (ta less than tb)</returns>
public static bool IsBefore(ITime ta, ITime tb)
{
return(ta.EndStampAsModifiedJulianDay() < tb.StampAsModifiedJulianDay);
}