click below
click below
Normal Size Small Size show me how
Seasons
Earth's seasons & motion
Term | Definition |
---|---|
sphere | Any round object that has a surface that is the same distance from its center at all points |
hemisphere | 1/2 of a sphere or globe |
equator | An imaginary line around the middle of the Earth at an equal distance from the North Pole and the South Pole |
axis | The imaginary straight line through the Earth in which it rotates around |
tilt | To slant such as the Earth's slant of 23 1/2 degrees |
orbit | The path followed by any heavenly body as it travels around another body, such as the earth around the sun |
rotate | To turn around a center axis |
solstice | The two times of the year when the sun is farthest from the equator in the north or south |
equinox | The two times of the year when the sun crosses the earth's equator and day and night are of equal length |
year | The length of time it takes earth to revolve around the sun 365 1/4 days |
day | The length of time it takes the earth to rotate once on its axis 24 hours |
winter solstice | The shortest day of the year in which the sun is at it's southernmost point below the equator, Dec 21 |
summer solstice | The longest day of the year when the sun is at it's northernmost point above the equator, June 21 |
spring equinox | The day of the year when the sun is directly over the equator, also called the vernal equinox, March 21 |
fall equinox | The day of the year when the sun is directly over the equator, also called the autumnal equinox, Sept 21 |