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Nov
20
comment What is the distance that the Moon travels during one orbit around the Earth?
Yes, I thought of a similar thing. Wikipedia states that the orbit of the Moon around the Sun is convex however, since the Sun's influence is much greater than the Earth's influence. So I don't know if a helix would be a good approximation... Maybe for the Sun/Jupiter/Ganymede system...?
Nov
20
comment What is the distance that the Moon travels during one orbit around the Earth?
What if you want to know the motion of the moon around the sun? How would you compute that?
Nov
20
comment What is the distance that the Moon travels during one orbit around the Earth?
Amazing, how close this answer is to the other one, although you did quite a few approximations!
Nov
19
comment How are the newly discovered Janus/Epimetheus rings different from the other rings of Saturn?
What's the structure like?
Nov
19
accepted How does a Bahtinov mask work?
Nov
19
comment How does a Bahtinov mask work?
If you could add a bit from the linked articles, I would accept your answer: "Always quote the most relevant part of an important link, in case the target site is unreachable or goes permanently offline."
Nov
18
asked How does a Bahtinov mask work?
Nov
18
comment How can we be sure that we have identified very distant stars correctly?
Interesting. So basically we are mostly stuck with parallax measurements in our own galaxy?
Nov
17
comment How can we be sure that we have identified very distant stars correctly?
I would say that the redshift in the spectrum plays a big role. The absorption lines are kind of like a fingerprint for the elements in the star. If those are shifted, we can calculate the redshift, and hence the distance.
Nov
17
awarded  Benefactor
Nov
16
awarded  Scholar
Nov
16
accepted Can the supernova remnant SN 1572 be observed by amateur astronomers?
Nov
15
awarded  Promoter
Nov
15
revised What's the largest non-spherical astronomical object in the universe?
Add SDSS image of IC1101
Nov
15
suggested approved edit on What's the largest non-spherical astronomical object in the universe?
Nov
15
answered What's the largest non-spherical astronomical object in the universe?
Nov
14
revised How are the newly discovered Janus/Epimetheus rings different from the other rings of Saturn?
Add link and picture to the ring in question
Nov
14
suggested approved edit on How are the newly discovered Janus/Epimetheus rings different from the other rings of Saturn?
Nov
7
awarded  Student
Nov
7
asked Can the supernova remnant SN 1572 be observed by amateur astronomers?