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Questions tagged [astronomy]

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

9 questions with no upvoted or accepted answers
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Minyan, netz hachamoh, 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 ...
Isaac Kotlicky's user avatar
4 votes
0 answers
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How do the outer planets: Uranus, Neptune and Pluto fit into Judaism?

It is not a secret that we discover new things in all fields of science, not mentioned in our sources all the time. We know that in Judaism the 7 planets represent/aligned with 7 spiritual forces and ...
Al Berko's user avatar
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2 votes
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Do Zmanim follow the city, or the Gavra?

Are halachic times for prayer, comencing Shabbos, ect. calculated according to a persons exact location or is there one "time-zone" for the entire city? And if yes, how would this apply for ...
Naftali Tzvi's user avatar
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2 votes
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A beracha on the "Great conjunction"?

Tonight (or earlier tonight in Israel) the planets Jupiter and Saturn come so close that one might think that they are a single star. Is this occasion to say the beracha of עושה מעשה בראשית? It is not ...
Mordechai's user avatar
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2 votes
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118 views

For the start of the day, is "sunset" astronomical or visible?

Yesterday was the equinox and I noticed that the day was longer than 12 hours according to the (secular) sunrise/sunset times. Curious, I did some investigation. One reason for the difference is how ...
Monica Cellio's user avatar
2 votes
0 answers
522 views

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?
Mordechai B.'s user avatar
1 vote
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Meaning / Significance of the Ring on planet Saturn

Shabbos and the planet Saturn are linked. I was wondering if anyone has a source for the ring(s) on the planet Saturn being a wedding between the Jews / Shabbos / Hashem? I heard this idea before but ...
Adam Kapelner's user avatar
1 vote
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What rabbis did explicitly deal with Heliocentrism (accepted or rejected)?

Following the closed question "whats-the-earliest-acknowledgment-of-heliocentrism", I'm looking for any rabbinic sources that explicitly deal with heliocentrism.
Al Berko's user avatar
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1 vote
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Does Judaism differentiate between a planet and a star?

On the 4th day, G-d created Sun, Moon and the stars. Besides the Moon, Mercury, Venus, Mars, Jupiter, and Saturn were known since ancient times (not mentioning the existence of the real stars). ...
Al Berko's user avatar
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