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This unit introduces students to some general concepts of astronomy. Topics include geocentric versus heliocentric theories of the solar system and how they explain the sun's movements, sidereal days versus solar days, and why we have seasons. There is also discussion of Kepler's laws of orbital motion, the phases of the Moon, how eclipses occur, and how tides are produced. A vocabulary list and downloadable, printable student worksheets are provided.


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