ISP 205 Lecture Notes - Lecture 2: Summer Triangle
29 Jan 2016
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Document Summary
Different stars are seen at different times of the year. Orion is seen in early evening in march. The summer triangle is seen in early evening in summer. A constellation is a region of the sky. The sky varies as earth orbits the sun. Stars are so far that they appear to be on a sphere with earth in the center. The celestial sphere spins around the north and south poles. Stars near the north celestial pole are circumpolar and never set. We cannot see stars near the south celestial pole.
