| A | B |
|---|
| time zone | any of the 24 divisions of the Earth's surface used to determine the local time for any given locality |
| hemisphere | either the northern or southern half of the earth as divided by the equator or the eastern or western half as divided by a meridian |
| season | 1 of the 4 divisions of the year (spring, summer, autumn, and winter) |
| equinox | either of the 2 occasions when day and night are of equal length |
| solstice | either of the 2 times of the year when the sun is at its greatest distance from the equator |
| orbit | to travel around a planet (or other celestial body) in a roughly circular path |
| elliptical orbit | the path the earth travels round the sun (in a ‘flattened circle’) |
| leap year | every fourth year that contains an extra day (February 29th) |
| revolution | an orbit of a planet around the sun |
| rotation | the turn of a planet around its axis |
| axis | an imaginary line around which an object rotates, e.g. the earth and other planets |
