The Sun and the Seasons

5 which causes the variation in declination the

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Unformatted text preview: plane by 23.5°, which causes the variation in declination. The Seasons Earth’s axis of rotation is inclined vs. the normal to its orbital plane by 23.5°, which causes the variation in declination. The Seasons Earth’s axis of rotation is inclined vs. the normal to its orbital plane by 23.5°, which causes the variation in declination. The Seasons The Seasons are only caused by a varying angle of incidence of the sun’s rays. Steep incidence → Summer Shallow incidence → Winter Light from the sun They are not related to Earth’s distance from the sun. In fact, Earth is slightly closer to the sun in (northern-hemisphere) winter than in summer. The Seasons Northern Summer Southern Winter Northern Winter Southern Summer The Seasons Earth’s distance from the sun has only a very minor influence on seasonal temperature variations. Earth’s orbit Earth in January (eccentricity greatly exaggerated) Sun Earth in July The Sun and its Motions Do Tutortial I-33 “Seasons I” Prather, pages 91 – 96....
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This note was uploaded on 01/31/2010 for the course AS 103 taught by Professor Millar during the Fall '08 term at Grand Rapids Community College.

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