shaah
Method to return a shaah zmanis (temporal hour) used by some zmanim according to the opinion of Rabbi Yaakov Moshe Hillel as published in the luach of the Bais Horaah of Yeshivat Chevrat Ahavat Shalom.
Day in this calculation day starts 72 minutes before sunrise in degrees alos 16.1˚ and ending 13.5 minutes after sunset in degrees tzais 3.7˚. This day is split into 12 equal parts with each part being a shaah zmanis.
Note that with this system, chatzos (mid-day) will not be the point that the sun is halfway across the sky. These shaos zmaniyos are used for Mincha Gedola calculation.
Return
the long millisecond length of a shaah zmanis. 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 Long.MIN_VALUE will be returned. See detailed explanation on top of the AstronomicalCalendar documentation.