International Year of Astronomy
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During the International Year of Astronomy it's really just a time to get more people hooked on looking in the sky's through telescopes. There are also parties held for everyone to look out in the sky and have fun with other people while they are doing it.
The reason that it is this date is because 400 years ago Galileon made his first discoveries with using a telescope. NASA is sponsoring it. There are over 100 countries participating in this event. The Galilean Nights are people made up of amateur and professional astronomers who are going to look at Galileans discoveries.