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1 answer
28 views

How do I find out when sidereal time was 13:30 on a certain date and location?

2 votes
1 answer
56 views

Syzygy: ONLY Three Aligned Bodies, or AT LEAST Three Aligned Bodies?

6 votes
1 answer
140 views

How exactly is UT1 measured/calculated?

7 votes
1 answer
754 views

How do I calculate the moment of the solstice?

2 votes
1 answer
67 views

How (the heck) does an astronomical Celescope work? And how did it get its name?

7 votes
1 answer
145 views

SKA 101: How will it "perform the most precise tests of Einstein's theories" and Australia & South Africa arrays be "made to work seamlessly together"

4 votes
1 answer
123 views

Why does X-shooter use double passes through prisms for Echelle cross-dispersion instead of gratings?

0 votes
1 answer
44 views

2D Galaxy Spectrum taken by long-slit-spectrograph

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0 answers
14 views

Galactic rotation curves data samples: how to get them?

14 votes
2 answers
3k views

How did asteroid (7482) 1994 PC1 get its "face"? Is it reconstructed from optical or radar imaging, or something else?

3 votes
0 answers
59 views

How will China's Xuntian space telescope use its Terahertz capability? THz Spectroscopy? Imaging? Something else?

1 vote
1 answer
40 views

What parameters about galaxies can be measured using SAO DS9?

11 votes
1 answer
1k views

Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? If so, how close was it?

1 vote
0 answers
40 views

Angular extent of this composite Chandra / JWST image of the Tarantula Nebula?

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