click below
click below
Normal Size Small Size show me how
Seasons
Why do we have seasons
| Term | Definition |
|---|---|
| Rotation | The spin of an object around its axis |
| Rotation axis | The line of which an object rotates |
| Orbit | The path an object follows as it moves around another object |
| Revolution | The orbit of one object around another object |
| Solstice | When earths rotation axis is tilted directly toward or away from the sun |
| Equinox | When earths rotation axis is tilted neither toward nor away from the sun |
| Phase | The lit part of the moon or a planet that can be seen from earth |
| Waxing phase | Phases of the moon during which more of the moons near side is lit each night |
| Waning phase | Phases of the moon during which more of the moons near side it lit each night |
| Umbra | The central, darker part of a shadow where light is totally blocked |
| Penumbra | The lighter part of a shadow where light is partially blocked |
| Solar eclipse | An occurrence during which the moons shadow appears on earths surface |