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been stated that in this way the first con-
ception of universal gravitation arose.[1]
Quite the most important event in the
whole history of physical astronomy was the
publication, in 1687, of Newton’s Principia
(Philosophiae Naturalis Principia Mathemat-
ica) . In this great work Newton started
from the beginning of things, the laws of
motion, and carried his argument, step by
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