| A | B |
|---|
| Celestial Sphere | an imaginary sphere |
| Celestial Object | An object found outside the earths 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 above the observer |
| Terrestrial | An inner planet,made up of land,rocks |
| Jovian | The gas planet,less dense than terrestrical |
| Auroras | a glow in the sky,hitting earths magnetic field |
| Satellites | a samller body,revolving around a larger body |
| Retrongrade motion | a periodic backwards,or westward,loop made by a planet |
| Comet | a mass of rock "Dirty snowball" |
| Meteor | a light that streaks throught the earths atmosphere |
| Asteroid | small planet's revolving the sun & between Mars and Jupiter |
| Orbit | the path of a revolving body,earth revolving around the sun |
| Elliptical Orbit | ellipse-shaped orbits with two foci |
| Heliocentric | the sun is its center |
| Geocentric | the earth is its center |
| Perihelion | when closest to the sun |
| Aphelion | farthest from the sun |
