Chapter 13 Vocabulary

5. the partial or total blocking of one object in space by another
8. an imaginary line that passes through a planet's center and is north and south poles, about which the planet rotates
9. the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth
10. the periodic rise and fall of the level of water in the ocean
11. the spinning motion of a planet on its axis
14. the tide with the least difference between consecutive low and high tides
16. the darkest part of a shadow

1. a system for organizing time that defines the beginning, length, and divisions of a year
2. the movement of an object around another object
3. either of the two days of the year on which the sun reaches its greatest distance north or south the equator
4. the blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon
6. the tide with the greatest difference between consecutive low and high tides
7. one of the different apparent shapes of the moon as seen from Earth
12. the path of an object as it revolves around another object in space
13. the part of the shadow surrounding the darkest part
15. either of the two days of the year on which neither hemisphere is tilted toward or away from the sun