plag
This method returns the time of plag hamincha based on the calculation of Chacham Yosef Harari-Raful of Yeshivat Ateret Torah, that the day starts 1/10th of the day before sunrise and is usually calculated as ending 40 minutes after sunset (configurable to any offset via .setAteretTorahSunsetOffset). shaos zmaniyos are calculated based on this day and added to alos to reach this time. This time is 10.75 shaos zmaniyos (temporal hours) after dawn.
Return
the Date of the plag. 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.