sof
This method returns the latest zman krias shema (time to recite Shema in the morning) based on the opinion that the day starts at alos 16.1˚ and ends at sea level sunset.
This is the opinion of the חידושי וכללות הרז״ה and the מנורה הטהורה as mentioned by Yisrael Vehazmanim vol 1, sec. 7, ch. 3 no. 16.
Three shaos zmaniyos are calculated based on this day and added to alos16Point1Degrees to reach this time. This time is 3 shaos zmaniyos (solar hours) after dawn based on the opinion that the day is calculated from a alos16Point1Degrees to sea level sunset.
Note: Based on this calculation chatzos will not be at midday.
Return
the Date of the latest zman krias shema based on this day. 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.