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

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Solar Power on Shabbos

What's the deal with using solar power on Shabbos? Cooking is permitted, but what of the following cases: 1) Heating water (Dud-Shemesh style) 2) Solar-powered watches 3) Solar-powered toys What ...
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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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On what basis do we understand references to Orion and the Pleiades in Iyov?

Iyov 38:31-32 reads: הַתְקַשֵּׁר מַעֲדַנּוֹת כִּימָה אוֹ מוֹשְׁכוֹת כְּסִיל תְּפַתֵּחַ: . הֲתֹצִיא מַזָּרוֹת בְּעִתּוֹ וְעַיִשׁ עַל בָּנֶיהָ תַנְחֵם: Can you tie the chains of the Pleiades ...