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 ...
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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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Does the Talmud have a source for the horoscope?

I have heard that the horoscopes are mentioned in the Talmud. If this is so what exactly does the Talmud have to say above the horoscopes? How does the Talmud's view different from the widespread ...