/r/Astronomy

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When does a sidereal year start?

7 upvotes • ducatidukeee

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Saturn through Celestron C11 SCT. Shot by Iphone X on 09/20/2023. I used PIPP, AutoStakkert for stacking and some light/contrast changes.

6 upvotes • Paramana5

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Noobs in S Colorado looking for the best spot for an all-nighter with kids.

6 upvotes • Sorry-Rain-1311

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Jupiter from my small refracting telescope

6 upvotes • MrCheddaa

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Where should I go to avoid light pollution if I live in Geneva?

6 upvotes • Taupe00

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I came across an old paper that describes using two stars to determine the observer's latitude and longitude. Is there a modern paper or a current expert who can explain the mathematical process involved in this method?

6 upvotes • djepoxy

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These stars on morning sky

6 upvotes • m3ruine0_x

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Triple lasers from the summit of Mauna Kea

5 upvotes • astrowahl

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How do I find galaxies in my telescope?

5 upvotes • OG_pooperman

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NGC6419 and vdB 132

5 upvotes • Dramatic_Expert_5092

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
When does a sidereal year start?	7	ducatidukeee
Saturn through Celestron C11 SCT. Shot by Iphone X on 09/20/2023. I used PIPP, AutoStakkert for stacking and some light/contrast changes.	6	Paramana5
Noobs in S Colorado looking for the best spot for an all-nighter with kids.	6	Sorry-Rain-1311
Jupiter from my small refracting telescope	6	MrCheddaa
Where should I go to avoid light pollution if I live in Geneva?	6	Taupe00
I came across an old paper that describes using two stars to determine the observer's latitude and longitude. Is there a modern paper or a current expert who can explain the mathematical process involved in this method?	6	djepoxy
These stars on morning sky	6	m3ruine0_x
Triple lasers from the summit of Mauna Kea	5	astrowahl
How do I find galaxies in my telescope?	5	OG_pooperman
NGC6419 and vdB 132	5	Dramatic_Expert_5092