Astronomy- Anderson 1

4. the partial or total blocking of one object in space by another
6. the darkest part of a shadow
9. a system of organizing time that defines the beginning, length, and divisions of a year
11. the attractive force between objects; the force that moves objects downhill
12. either of the two days of the year on which the sun reaches its greatest distance north or south of the equator
15. either of the two days of the year on which neither hemisphere is tilted toward or away from the sun
16. eclipse the blocking of sunlight to the moon that occurs when earth is directly between the sun and the moon
17. dark, flat areas on the moon's surface formed from huge ancient lava flows
18. the movement of an object around another object

1. the part of a shadow surrounding the darkest part
2. tide the tide with the greatest difference between consecutive low and high tides
3. tide the tide with the least difference between consecutive low and high tides
5. one of the different apparent shapes of the moon as seen from earth
7. the path of an object as it revolves around another object in space
8. the scientific law that states that states that every object in the universe attracts every other object
10. a chunk of rock or dust in space, generally smaller than an asteroid
12. eclipse the blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
13. the periodic rise and fall of the level of water in the ocean
14. a large round pit caused by the impact of a meteoroid
16. of universal