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TeachMeFinance.com - explain perihelion perihelion The term 'perihelion' as it applies to the area of the weather can be defined as ' The point on the annual orbit of a body (about the sun) that is closest to the sun; at present, the earth reaches this point on about 5 January. Opposite of aphelion'. The term 'perihelion' as it applies to the area of Earth observation can be defined as ' The point in the orbit of a planet or comet which is nearest the Sun (as opposed to the aphelion, which is the point in the orbit farthest from the Sun)'. Previous 5 Terms: perigean range perigean tidal currents perigean tides Perigee perigee (aka periapsis or perifocus) Next 5 Terms: perimeter period period period decay (aka decay) periodic current 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.