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1 vote
2 answers
2k views

Calculate Dec and RA of a star from Euler angles and GPS data

6 votes
1 answer
335 views

General process of calculating what a telescope's diffraction spikes would look like?

2 votes
1 answer
92 views

What is the diameter of a telescope lens that will capture the surface of Proxima Centauri b?

5 votes
2 answers
825 views

What is the gain of a telescope?

1 vote
1 answer
59 views

Can we see the colorful patches or the strip of milky way galaxy with reflector telescopes?

0 votes
1 answer
257 views

How to make a 65 cm lens with a 20 cm hole in it for a Hamiltonian telescope?

1 vote
0 answers
67 views

Can we use plain mirror as a secondary mirror in cassegrain telescope?

18 votes
6 answers
5k views

Could we detect the light of cities at night in other solar systems?

6 votes
1 answer
547 views

For lenses, what is the practical difference between plano- and bi-?

2 votes
1 answer
95 views

Could two-way mirrors be used to completely eliminate obstruction for a reflector telescope?

11 votes
2 answers
971 views

What visual artifacts are expected from the JWST?

4 votes
1 answer
201 views

What is the probability that a photon that enters the aperture is registered?

3 votes
1 answer
96 views

Why does the altitude-azimuth mount have a blind spot near zenith?

4 votes
0 answers
77 views

Is my TAL-1 telescope too old to be useful

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