In this episode of Hebrew Voices, Orthodox Jew Who Sights the New Moon, Nehemia Gordon delves deep into Rosh Chodesh with Dr. Roy Hoffman, founder of the Israeli New Moon Society. From Moses, to Hillel the Younger, to Maimonides, Hoffman explains Orthodox perspectives related to sightings of the new moon.  Hoffman also introduces LunaCal, a free software application he developed to calculate when and where the new moon is most lightly to be visible.