Titlebook: Dark Companions of Stars; Astrometric Commenta Peter Kamp Book 1986 D. Reidel Publishing Company 1986 Galaxy.astrometry.astronomy.earth.gra

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LARK

Our Solar Systemarch, provincial though it may seem on a cosmic scale, has given us important and novel information about the physical and chemical composition of the planets and has contributed to better understanding of their origin (Chapter 8).

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Book 1986tem reveals an assembly of planets, terrestrial, giant and Pluto. The orbital motions are in the same sense, counter clockwise, as seen from the north of the general flattened space within which the planetary motions are confined. This state of affairs is corevolving and, more or less, coplanar. The

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Myelin

Stellar Motionsus, and as much as 57′ for Arcturus, both exceeding the apparent diameter of the Moon. Since Newton’s law of gravitation was established, it should be no surprise — on the contrary, it had to be expected that stars must be in some state of motion, to counteract a possible collapse due to gravitation.

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Stellar Distances a baseline would seem to hold some promise of revealing annual parallactic changes in the positions of the ‘fixed’ stars. These shifts were not observed for three centuries after Copernicus; and in the meantime the heliocentric viewpoint was not acceptable to many astronomers, Tucho Brahe (1546–1601), for instance.

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