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Unformatted text preview: 9. Blackbody : sun and earth, perfect absorber 10. Greenhouse effect : absorption of infrared radiation from Earth by water vapor and CO2 11. Albedo : percent radiation returning from given surface compared to initially striking surface 12. Summer solstice : June 21 13. Autumnal equinox : September 22, 12 hours of daylight 14. Winter solstice : December 21 15. Vernal equinox : March 20 In the southern hemisphere, it is opposite. The tilt of the Earths axis is the cause of the seasons....
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- Spring '08