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I'm playing with an idea of making a little program to draw the sky. Nothing fancy, just for fun. And I'm reading about projections.

Now I know that I must use different projections depending on my field of view. My idea is to start with fairly large field of view (FOV), say 45 deg (and therefore with a large distortion) and be able to reduce the FOV ("zoom in").

What should I use?

Another thing is with transitions between two projections. They should look almost the same for at least one FOV, to make it smooth.

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You can look at Stellarium - it supports several projection types and can give you an idea what the sky looks like in them. Its default projection is stereographic, with an initial FOV of 60°.

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