| A | B |
|---|
| revolution | the movement of the Earth around the sun |
| rotation | the spinning of a planet on it's axis |
| perihelion | the closest point of the sun to the Earth |
| aphelion | the farthest point of the sun to the Earth |
| summer slostice | the beginning of summer-90 degreese over the Tropic of Cancer |
| winter solstice | the beginning of winter-90degreese over the Tropic of Capricorn |
| autumnal equinox | when the sun strikes the Earth at 90 degreese along the equator-september 22/23 |
| vernal equinox | when the sun strikes the Earth at a 90 degree angle again-march 21/22 |
| precession | the wobbling of the Earth |
| standard time zones | the deviding of the Earth into 24 time zones |
| daylight saving time | the system where clocks are set 1 hour ahead of standard time from april to october |
| international date line | an imaginary line running from North to South through the pacific ocean |
| satellite | any object in orbit around another body with a larger mass |
| geosynchronus orbit | a satellite in orbit that always remains directly above the Earth's equator and moving in the direction of the Earth's rotation |
| polar orbit | a satellite over the North and South poles |
| perigee | the closest point of a satellite to the Earth |
| apogee | the farthest point of a satellite to the Earth |
