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

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Levana or Yareach?

In the entire Tanach the moon is generally called Yareach. There are 3 instances where it is called Levana. One is ישעיהו: כד. כג. וחפרה הלבנה ובושה החמה. Another one is ישעיהו: ל. כו. והיה אור הלבנה ...
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Shooting Stars and Luck

There seems to be a non-Jewish association of good luck with seeing a shooting star. Is there any source for this in Judaism?
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Minyan, netz hachomah, and precision in time

There are halachic sources that discuss the importance of davening shemona esrei at netz (at sunrise), some of which state that it is preferable to daven at netz over davening with a minyan (at least ...
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Crossing the International Date Line too many times during Sefirah

The Lubavitcher Rebbe brought the chiddush (I don't know if everyone holds by it) that one must delay one's celebration of Shavuos by a day if one loses a day in the count as a result of crossing the ...