| A | B |
|---|
| astronomy | study of objects in space |
| axis | imaginary line passing through the center of an object |
| rotation | to spin on an axis |
| revolve | to travel around another object |
| orbit | path an object takes as it revolves around another object |
| year | the time it takes earth to revolve the sun=365 1/4 days |
| day | the time it takes earth to rotate once on its axis=24 hours |
| seasons | caused by tilt of earth on its axis as it revolves the sun |
| latitude | imaginary lines running parallel to the equator |
| longitude | imaginary lines running parallel to the Prime Meridian |
| solstice | occurs two times a year when the sun is directly in line with the Tropic of Cancer or Tropic of Capricorn |
| equinox | Two times a year when the sun is directly in line with the equator and we have equal days and equal nights |
| Tropic of Cancer | 23.5 degrees north of the equator, when the sun is lined up with it the Northern hemisphere has summer solstice |
| Tropic of Capricorn | 23.5 degrees south of the equator, when the sun is lined up with it the northern hemisphere has winter solstice |
| leap year | occurs every 4 years and has 366 days |
| vernal equinox | first day of spring |
| autumnal equinox | first day of fall |
