alos72
Method to return alos (dawn) calculated using 72 minutes before sunrise or sea level sunrise (depending on the isUseElevation setting). This time is based on the time to walk the distance of 4 Mil at 18 minutes a Mil. The 72 minute time (but not the concept of fixed minutes) is based on the opinion that the time of the Neshef (twilight between dawn and sunrise) does not vary by the time of year or location but depends on the time it takes to walk the distance of 4 Mil.
Return
the Date representing the time. 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.