Unformatted text preview: is the point on the celestial sphere that lies directly above you, while the Nadir is directly below you. Horizon separates sky from ground. • Eclipses: solar (moon is between earth and sun), lunar (earth passes between sun and the moon, creating shadow), annular (body in front does not completely cover the other, such as a ring of light) • the tilt of the Earth’s axis creates seasons, also why sun is tilted in respect to the celestial equator. • Eclipses don’t occur monthly because the moon’s orbit is tipped with the Earth’s, so shadows may pass above or below....
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- Spring '08
- North Pole, Ecliptic, Celestial coordinate system