Earth-Sun-Moon

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Across
  1. 1. In astronomy, the change in the sunlit area of one celestial body as seen from another celestial body; phases of the moon are caused by the changing positions of earth, the sun, and the moon.
  2. 3. The path that a body follows as it travels around another body is space.
  3. 4. A division of the year that is characterized by both earth's tilt relative to the sun and earth's position in it's orbit around the sun.
Down
  1. 2. An event in which the shadow of one celestial body falls on another.