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Earth's seasons & motion

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
Created by: dmiles
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