Photo: Flickr user lifeontheedge

Sunday, January 06, 2008

The galactic year is the duration of time required for the solar system to orbit once around the center of the Milky Way galaxy.

It invites comparisons to the year (the duration of time it takes the Earth to orbit once about the Sun) and the month (traditionally the duration of time it take the moon to complete one orbit around the Earth). It also provides a conveniently "graspable" unit for thinking about cosmic and geological time periods

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