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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 Earths axis creates seasons, also why sun is tilted in respect to the celestial equator. Eclipses dont occur monthly because the moons orbit is tipped with the Earths, so shadows may pass above or below....
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- Spring '08