Lecture 3 - (Lecture 3) Some Things to Know. The earth...

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(Lecture 3) Some Things to Know… The earth intercepts less than 2 billionths of all of the sun’s energy However solar energy represents 99.9% of the energy that heats the earth’s surface If the sun stops shining, global scale winds would cease Wind blows because of unequal heating of earth’s surface Motions of the Earth Rotation o Spinning of the earth on its axis once every 24 hours Revolution o Movement of earth in orbit around sun occurs every 365.5 days Altitude of the Sun (angle of sun above the horizon) 90 degrees overhead - most direct rays More of an angle determines the number of “atmospheres” that the sun’s rays must traverse o Atmosphere used as a unit of measurement o 1 “atmosphere” 90 degrees overhead o 2 “atmospheres” 30 degrees above horizon o 11 “atmospheres” 5-10 degrees above the horizon The Earth’s Seasons 21 March Vernal Equinox 21 June Summer Solstice 21 September Autumnal Equinox 21 December Winter Solstice
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This note was uploaded on 07/21/2008 for the course GRG 301K taught by Professor Kimmel during the Summer '08 term at University of Texas at Austin.

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Lecture 3 - (Lecture 3) Some Things to Know. The earth...

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