tzais96Zmanis
Method to return tzais (dusk) calculated using 96 minutes zmaniyos or 1/7.5 of the day after sea level sunset.
Return
the Date representing the time. If the calculation can't be computed such as in the Arctic Circle where there is at least one day a year where the sun does not rise, and one where it does not set, a null will be returned. See detailed explanation on top of the AstronomicalCalendar documentation.