The Logical Leap: Induction in Physics
$5.09 - $21.10
The Stars: Learn the Bright Stars and Important Constellations
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Seasons & the Celestial Sphere: Learn season, sundials, and get a 3-D view of the sky
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Early Astronomical Measurement I
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An Old Indian Told Me
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Sun, Moon & Planets: Learn about the Sun and Moon, and how to locate the planets (Astronomy, #1)
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