tzais
This method returns the tzais (nightfall) based on the opinion of the Geonim calculated at the sun's position at ZENITH_8_POINT_5 below the western horizon.
Return
the Date representing the time when the sun is 8.5 below sea level. If the calculation can't be computed such as northern and southern locations even south of the Arctic Circle and north of the Antarctic Circle where the sun may not reach low enough below the horizon for this calculation, a null will be returned. See detailed explanation on top of the AstronomicalCalendar documentation.
See also
ZENITH_