Posted by: tpsciencefun | September 21, 2012

Why Is September 22, 2012 the Beginning of Fall?

The first day of fall and the first day of spring are called an equinox and represnt  an astronomical moment ( a space moment because we are part of something much bigger than ourselves, we are part of the Solar System).  So, what is  an equinox and why is it an astronomical moment? 

The Equinox is that Astronomical moment when the Earth has reached the Midpoint of its journey around the Sun; consequently Day and Night are of equal length.

At the Spring Equinox; that is Spring in the Northern Hemisphere and Autumn in the Southern Hemisphere the Earth is traveling away from the Sun

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