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| When the sun is directly over the equator on September 23 |
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| An imaginary straight line around which an object, like a planet, turns;a line that goes through the North and South Poles |
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| The days in which daytime and nighttime are of equal duration |
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| the movement of one object around another;the movement of the Earth around the Sun takes one year |
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| To move in orbit around another object |
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| To turn around a central point or axis |
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| The time that it takes a planet, moon or other orbiting body to turn once around its axis - one "day". |
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| A closed path that an object takes as it revolves around another body. They are generally elliptical. |
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| Spring, summer, fall (autumn), and winter; caused by the tilt of the Earth's axis. |
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| Days when the Sun reaches its farthest northern and southern declinations; marks the beginning of winter (this is the shortest day of the year) and marks the beginning of summer (this is the longest day of the year). |
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| June 21 (this is the LONGEST day of the year). |
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| When the sun is directly over the equator on March 21 |
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| occurs on December 21 and marks the beginning of winter (this is the shortest day of the year) in the Northern Hemisphere. |
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| Distance from the earth to the sun |
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| approximately 93 million miles |
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