sof
This method returns the latest zman krias shema (time to recite Shema in the morning) according to the opinion of the Magen Avraham (MGA) based on alos being 90 minutes before sunrise. This time is 3 shaos zmaniyos (solar hours) after dawn based on the opinion of the MGA that the day is calculated from a dawn of 90 minutes before sunrise to nightfall of 90 minutes after sunset. This returns the time of 3 * shaahZmanis90Minutes after dawn.
Return
the Date of the latest zman krias shema. 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.