Astronomy Group
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New in Astronomy Group 
Stars have different brightnesses. There's an astronomical brightness...
Answer posted by enotechris in Astronomy.
Movements of celestial bodies in the solar system can be deduced from...
Discussion post added by giorgiana1976 in Astronomy.
The question of who invented the first calendar is very hard to answer...
Answer posted by pohnpei397 in Astronomy.
Rotation of a celestial body refers to its movement around its own axis....
Discussion post added by krishna-agrawala in Astronomy.
