1. Chapter 17
Earth’s Cycles

2. axis
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An imaginary line that goes through the center of the earth passing through the North Pole and the South Pole

3. rotation
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The spinning of Earth around its axis (24 hours)

4. revolution
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The movement of one object around another. Earth’s trip around the Sun. (1 Year)

5. orbit
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The path Earth follows as it revolves around the Sun.

6. ellipse
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A circle stretched out in opposite directions. Earth’s path around the Sun is an ellipse.

7. eclipse
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Occurs when one object in space gets between the Sun and another object, and casts its shadow on the other object.

8. lunar eclipse
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When the Moon passes through Earth’s shadow

9. solar eclipse Turn & Talk
Occurs when the Moon passes between the Sun and the Earth and casts its shadow on Earth.

10. constellation
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Star patterns