The study or observation of objects or phenomena outside the Earth, including the Sun, Moon, planets, and stars.

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2
votes
2answers
158 views

Why is my molad-time chart off by a day?

The HaMaor Mikraos Gedolos chumash has a chart of molad (forecasted first visibility of the new moon in Jerusalem, based on averages observable to the naked eye, assuming Jerusalem local time; am I ...
4
votes
1answer
375 views

Jewish Sunrise and Sunset

How can one calculate Jewish sunrise and sunset? I'm not necessarily asking for a formula. Just wondering if there's a difference between Halachik rise/set and what the world considers [e.g. science] ...
7
votes
6answers
938 views

How to Resolve Kiddush Levana and Celestial Worship, (Avodas Kochavim)?

In general Kiddush Lavanah has always seemed to me to be akin to "Avodas Kochavim" - so does anyone know of a satisfying answer that works with Occam's razor? More specifically: We say Just as I can ...