The Hill-Brown Theory of the Moons Motion

Name: The Hill-Brown Theory of the Moons Motion
Brand: Springer Nature
SKU: 9781441959379
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Springer Nature

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9781441959379

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The HillBrown theory of the Moons motion was constructed in the years from 1877 to 1908, and adopted as the basis for the lunar ephemerides in the nautical almanacs of the US, UK, Germany, France, and Spain beginning in 1923. At that time and for some decades afterward, it was the most accurate lunar theory ever constructed. Its accuracy was due, rst, to a novel choice of intermediary orbit or rst approxi- tion, more nearly closing in on the Moons actual motion than any elliptical orbit ever could, and secondly to the care and discernment and stick-to-it-ive-ness with which the further approximations (perturbations to this initial orbit) had been computed and assembled so as yield a nal theory approximating the Moons path in real space with an accuracy of a hundredth of an arc-second or better. The method by which the HillBrown lunar theory was developed held the potentiality for still greater accuracy. The intermediary orbit of the HillBrown theory may be described as a periodic solution of a simpli ed three-body problem, with numerical parameters carried to 15 decimal places. George William Hill, a young American mathematician working for the U. S. Nautical Almanac Of ce, had proposed it, and computed the numerical parameters to their 15 places. A self-effacing loner, he had in his privately pursued studies come to see that the contemporary attempts at predicting the Moons motion were guaranteed to fail in achieving a lunar ephemeris of the accuracy desired.

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