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TeachMeFinance.com - explain Solar constant Solar constant The term 'Solar constant' as it applies to the area of Earth observation can be defined as ' Aka total solar irradiance. The constant expressing the amount of solar radiation reaching the Earth from the sun, approximately 1370 watts per square meter. It is not, in fact, truly constant and variations are detectable'. The term 'Solar constant' as it applies to the area of energy can be defined as ' The average amount of solar radiation that reaches the earth's upper atmosphere on a surface perpendicular to the sun's rays; equal to 1353 Watts per square meter or 492 Btu per square foot'. Previous 5 Terms: Soil sterilant Soil subsidence Soil survey Soil-cement bedding solar backscatter ultraviolet radiometer (SBUV) Next 5 Terms: Solar cooling Solar Coordinates solar cycle Solar declination Solar energy About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.