The full moon, now among the stars of the constellation Pisces, rises at sunset this evening. This is the Harvest Moon, the full moon which occurs nearest the autumnal equinox, the beginning of fall, which was on September 22nd. In the old days, the light of this full moon was a help to farmers who brought in their harvest of crops, both day and night. The full moon is up all night long - it rises at sunset and doesn’t set until sunrise. Ordinarily the moon rises almost a full hour later from one night to the next, but the Harvest Moon rises only about a half hour later each night, because the angle that the moon’s orbital path makes with our horizon is very shallow at this time of year. This allows it some extra “hang time” in our skies, prolonging its usefulness as a celestial “night light.” October’s full moon was also called the blood moon in medieval England, a reference to the reddish coloring often displayed by the rising full moon of October.