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Brahmagupta (c. 598 – c. 668 AD) was the first Indian scholar to describe gravity as an attractive force: [38] [39] [failed verification] [40] [41] [failed verification] The earth on all its sides is the same; all people on the earth stand upright, and all heavy things fall down to the earth by a law of nature, for it is the nature of the ...
Here Brahmagupta found the result in terms of the sum of the first n integers, rather than in terms of n as is the modern practice. [24] He gives the sum of the squares of the first n natural numbers as n(n + 1)(2n + 1) / 6 and the sum of the cubes of the first n natural numbers as ( n(n + 1) / 2 ) 2.
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]
Newton "recognized Christ as a divine mediator between God and man, who was subordinate to the Father who created him." [150] He was especially interested in prophecy, but for him, "the great apostasy was trinitarianism." [151] Newton tried unsuccessfully to obtain one of the two fellowships that exempted the holder from the ordination requirement.
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[249] [250] LIGO-VIRGO and Fermi constrain the difference between the speed of gravity and the speed of light in vacuum to 10 −15. [251] This marks the first time electromagnetic and gravitational waves are detected from a single source, [252] [253] and give direct evidence that some (short) gamma-ray bursts are due to colliding neutron stars ...
Before the advent of general relativity, Newton's law of universal gravitation had been accepted for more than two hundred years as a valid description of the gravitational force between masses, even though Newton himself did not regard the theory as the final word on the nature of gravity. Within a century of Newton's formulation, careful ...
The first new effect is the gravitational frequency shift of light. Consider two observers aboard an accelerating rocket-ship. Aboard such a ship, there is a natural concept of "up" and "down": the direction in which the ship accelerates is "up", and free-floating objects accelerate in the opposite direction, falling "downward".