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14 Cards in this Set
- Front
- Back
Direct sunlight |
sunlight that strikes Earth’s surface at close to a 90° angle. |
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Earth’s axis |
an imaginary line through the center of Earth that connects the North Poleto the South Pole. |
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Earth rotates about its axis once every 24 hours.Earth’s axis is tilted at an angle of 23.5 degrees. |
Equator |
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an imaginary horizontal line around the middle of Earth. |
Northern hemisphere |
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the half of Earth north of the equator. |
North Pole |
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the northernmost point on Earth. |
Indirect sunlight |
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sunlight that strikes Earth’s surface at an acute angle (less than 90 |
Season |
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one of the major divisions of the year, usually based on regular weatherchanges. |
In most places, the year is divided into four seasons: winter, spring, summer, andautumn (fall). Each season is three months long. o In tropical regions, average temperatures do not change much during the year. In these regions, it is common to refer to the “rainy season” and the “dry season.” |
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Solstice |
one of two days during the year on which the direct rays of the Sun reach thefarthest from the equator. |
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Southern hemisphere |
the half of Earth south of the equator. |
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South Pole |
the southernmost point on Earth. |
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Summer solstice |
the first day of summer. |
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The summer solstice is the longest day of the year. North and south of thetropics, it is also the day when the noon Sun is highest in the sky. o In the northern hemisphere the summer solstice occurs on or near June 21. o In the southern hemisphere the summer solstice occurs on or near December 21. |
Winter solstice |
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the first day of winter. |
The winter solstice is the shortest day of the year. It is also the day when thenoon Sun is lowest in the sky. o In the northern hemisphere the winter solstice occurs on or near December 21. o In the southern hemisphere the winter solstice occurs on or near June 21. |