Unit 5 Vocabulary (Sun / Earth / Moon System)

4. a geographic coordinate that specifies the north–south position of a point on the surface of the Earth, or another celestial body.
7. the largest tidal range that occurs when the Sun, Earth, and the Moon form a straight line.
8. a length of time that is one quarter of Earth's revolution. Results in changing weather conditions due solely to the directness of the Sun's light on Earth's surface.
11. the imaginary line that divides the Earth into the northern and southern hemispheres.
12. the apparent shape of the Moon's directly sunlit portion as viewed from the Earth.
15. the point in the orbit of a planet or other astronomical body, at which it is closest to the sun
17. every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
20. the lighter part of a shadow where light is partially blocked
23. the lowest tidal range that occurs when the Sun, Earth, and the moon form a right angle.
25. when the ocean's surface reaches its highest point due to the gravitational interaction of the moon and the ocean's water.
26. when more of the Moon's near side is lit each night.
27. the line around which an object rotates.

1. a half of a sphere (or half of Earth as divided by the equator).
2. when the ocean's surface is at its lowest point due to the position of the Earth's surface relative to the moon and the force of gravity between them.
3. a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body.
4. when the moon moves into the Earth's shadow.
5. an imaginary flat surface that describes the path of Earth's orbit around the Sun.
6. the orbit of one object around another object.
8. when the Moon's shadow appears on the Earth's surface.
9. an attractive force that exist between all objects that have mass.
10. the period of time it takes for earth to complete one full rotation
13. the spin of an object around its axis.
14. roughly the time it takes for the moon to complete one full orbit around the Earth and complete its phase cycle.
16. The period of time that the Earth takes to complete one full revolution.
18. the path an object follows as it moves around another object in space.
19. when less of the Moon's near side is lit each night.
21. the central, darker part of a shadow where light is totally blocked.
22. the difference in water height between a high tide and a low tide.
24. the point in the orbit of a planet or other astronomical body, at which it is farthest from the sun