| A | B |
|---|
| celestial sphere | an imaganary sphere that surounds the the earth |
| celestial object | a celestial object is found in the sky outside the earth's atmosphere. |
| rotation | the turning of an object on its axis. |
| revolution | the movement of earth in its orbit around the sun. |
| zenith | point in the sky directly above the observer. |
| terrestial | another name for the inner planets. |
| jovian | all the outter planets except for pluto. |
| auroras | glows in the nighttime sky produced in the upper atmosphere by solar radiation hitting earth's magnetic field. |
| satellites | a smaller revolving around a larger body. |
| retrogade motion | A periodic backward or westard loop made by a planet. |
| comet | a dirty snowball |
| metor | a shotting star |
| asteriod | planetlike bodies revolving around the sun between the orbits of mars and jupiter. |
| orbit | the path of a revolving body. |
| elliptical orbit | ellisped shaped orbits. |
| heliocentric | a model of the earth in which the sun is te center |
| geocentric | model that has earth as its center. |
| perihelion | planets are nearest to the sun |
| aphelion | planets farthest from the sun |
