| A | B |
|---|
| revolve | the movement of one object around another |
| rotate | to spin around itself |
| axis | an imaginary line that passes through the Earth's center |
| orbit | the path an object takes when it revolves around another object. |
| solstice | when direct or indirect sunrays hit the Earth. |
| equinox | when direct sunrays hit the Earth equally |
| equator | imaginary line that separates the northern and Southern Hemisphers. |
| Tropic of Cancer | imaginary line north of the equator |
| Tropic of Capricorn | imaginary line south of the equator. |
| waxing | when the illumination of the moon increases |
| waning | when the illumination of the moon decreases |
| gibbous | when more than half of the moon is illuminated (lit) |
| crescent | when less than half of the moon is illuminated |
