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2014 Sun-Earth-Moon
Earth Science 2014
Term | Definition |
---|---|
Solar Eclipse | Occurs when the moon passes between the Earth and the sun, casting its shadow on the Earth. Can occur only during a new moon. |
Lunar Eclipse | occurs when the Earth passes between the sun and moon, casting its shadow on the moon. Can occur only during a full moon |
Orbit | path of one object around another. |
Revolution | movement of one object around another |
Solstice | Occurs on the first day of summer (June 21/22) and the first day of winter (Dec. 21/22) |
Equinox | Occurs on the first day of spring (March 21/22)and the first day of fall (September 21/22) when the sun shines most directly at the equator creating periods of equal day and night. |
Tropic of Capricorn | 23.5 degrees south latitude. The number of degrees south of the equator upon which the suns rays shine most directly on the first day of winter in the northern hemisphere |
Tropic of Cancer | 23.5 degrees north latitude. The number of degrees north of the equator upon which the suns rays shine most directly on the first day of summer in the northern hemisphere |
Ecliptic | plane upon which the sun, planets and signs of the Zodiac are located. |
Aphelion | Point in the orbit of a planet when it is furthest from the sun. For the Earth that occurs in July |
Perihelion | Point in the orbit of a planet when it is nearest the sun. For the Earth, that occurs in January |
Ellipse | geometric shape made by using two points. Unlike a circle made with one point |
Eccentric | irregular: not round |
Geocentric | Earth-centered solar system. |
heliocentric | Sun-centered solar system. |
rotation | spinning on an axis |