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The publication of the law has become known as the "first great unification", as it marked the unification of the previously described phenomena of gravity on Earth with known astronomical behaviors. [1] [2] [3] This is a general physical law derived from empirical observations by what Isaac Newton called inductive reasoning. [4]
Isaac Newton was born (according to the Julian calendar in use in England at the time) on Christmas Day, 25 December 1642 (NS 4 January 1643 [a]) at Woolsthorpe Manor in Woolsthorpe-by-Colsterworth, a hamlet in the county of Lincolnshire. [27] His father, also named Isaac Newton, had died three months before.
Isaac Newton's apple tree at Woolsthorpe Manor [1] [2] represents the inspiration behind Sir Isaac Newton's theory of gravity.While the precise details of Newton's reminiscence (reported by several witnesses to whom Newton allegedly told the story) are impossible to verify, the significance of the event lies in its explanation of Newton's scientific thinking.
1684 – Isaac Newton proves that planets moving under an inverse-square force law will obey Kepler's laws in a letter to Edmond Halley. [7] 1686 – Isaac Newton uses a fixed length pendulum with weights of varying composition to test the weak equivalence principle to 1 part in 1000. [9] [10]
The "first great unification" was Isaac Newton's 17th century unification of gravity, which brought together the understandings of the observable phenomena of gravity on Earth with the observable behaviour of celestial bodies in space. [2] [4] [5] His work is credited with laying the foundations of future endeavors for a grand unified theory.
1665 – Cassini determines the rotational speeds of Jupiter, Mars, and Venus. [95] 1668 – Isaac Newton builds his own reflecting telescope, the first fully functional of this kind, and a landmark for future developings as it reduces spherical aberration with no chromatic aberration. [96] 1672 – Cassini discovers Saturn's moons Iapetus and ...
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The first extant sources discussing such theories are found in ancient Greek philosophy. This work was furthered through the Middle Ages by Indian, Islamic, and European scientists, before gaining great strides during the Renaissance and Scientific Revolution—culminating in the formulation of Newton's law of gravity.