Perihilion

Perihilion - Perihelion When the earth is closest to the...

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Perihelion. When the earth is closest to the sun, January 3 rd , and it’s 91.5 million miles away. Aphelion- When the Earth is furthest away from the sun, July 4 th , 94.5 million miles away. Seasons are formed because of the Earth’s tilt on a 23.5 degree axis. Johanne Keplars 3 Laws of Planetary motion 1) The path of each planet around this sun is an ellipse 2) Each planet revolves so that a line attached to it and the sun sweeps over equal areas and intervals at all times. The orbit speed determines distance from the sun. when closer, it moves faster; further it moves slower. 3) Planets orbital period squared is equal to average solar distance. P squared = D cubed The Earth is 23.5 degrees from a line perpendicular to the ecleptic. This causes our seasons. June Solstice- June 21 st . the sun is directly over the 23.5 North parallel. September Equinox- September 21 st . Sun is directly over the equator. Heading South. Equal periods of daylight/night. December Solstice- December 21
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This note was uploaded on 10/25/2009 for the course GY 101 taught by Professor Dixon during the Spring '07 term at Alabama.

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Perihilion - Perihelion When the earth is closest to the...

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