What constellations can I see tonight?

Answer

You can check a night sky mapper for your latitude and longitude in order to see which constellations you can see tonight. It varies with whether you are in the Northern hemisphere or the Southern hemisphere as to which stars you will be able to see.
Reference:
1 Additional Answer
Stars are basically characterized on the basis of their spectral light. Astronomers classify stars using a series of letters, O, B, A, F, G, K and M. O is assigned to the hottest stars while M is assigned to the coolest stars.
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