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mathman
mathman is offline
#2
Nov29-12, 03:09 PM
Sci Advisor
P: 5,942
Newton's theory is a very good approximate description of gravity. Einstein's theory (General Relativity) is more accurate and does provide a theoretical underpinning.

For most calculations Newton's theory works fine - the Apollo mission as well as most space exploration uses it.

A practical example where G.R. is needed is GPS navigation.