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| "The motion of Earth around the Sun, which takes about 365 1/4 days, or one year, to complete" |
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| "Spinning of Earth on its axis, which causes day and night; it takes 24 hours for Earth to complete one rotation." |
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| Curved path followed by Earth as it moves around the Sun |
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| "Imaginary line around which Earth spins, causing day and night, and that is drawn from the north geographic pole through Earth to the south geographic pole" |
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| Twice-yearly time when the Sun is directly above Earth's equator and the length of day equals the length of night worldwide |
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| "Time when the Sun reaches its greatest distance north or south of the equator, which occurs June 21 or 22 for the northern hemisphere (longest day of the year) and December 21 or 22 for the southern hemisphere (shortest day of the year)" |
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| "Approximately June 22 in the Northern Hemisphere when the sun is highest in the sky and directly overhead at latitude 23.5º N, the Tropic of Cancer" |
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| "Approximately December 22 in the Northern Hemisphere when the sun is lowest in the sky and directly overhead at latitude 23.5ºS, the Tropic of Capricorn" |
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| "The sun is on the equator moving north, and marks the beginning of spring" |
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| "The sun is on the equator moving south, and marks the beginning of fall" |
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| INcoming SOLar radiaATION; energy from the Sun |
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| Indirect or slanted rays of the Sun |
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