The Physical Environment

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Circle of Illumination

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Circle of Illumination

Image credit: M. Ritter
Used with permission

 

The Circle of Illumination is the boundary between day and night. The circle of illumination always bisects the equator.

 
 

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© 2003 - 2015 Michael Ritter (tpeauthor@mac.com)
Last Revised September 26, 2006