| A | B |
|---|
| astronomy | the study of the moon, stars and other objects in space |
| rotation | the spinning motion of a planet about its axis |
| axis | an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates |
| revolution | the movement of one object around another object |
| orbit | one complete revolution around the sun |
| oval shaped | direction of an orbit |
| earth's calendar day | 365 and 1/4 of a day |
| February | the extra day month every 4 years (from 28 to 29 days) |
| seasons are because... | the Earth's axis is tilted as it moves around the sun |
| solstices | Season in late June and December |
| equinoxes | Season in late March and late September |
| latitude | a measurement of distance from the equator, expressed in degrees north or south |
| vernal equinox | occurs in the spring |
| autumnal equinox | occurs in the fall |
| phases | the different shapes of the moon you see from Earth |
| 27.3 days | the amount of time that the moon revolves around its own axis |
