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Proper motion - History
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Proper motion - History

Proper motion, Proper motion - History, Proper motion - Introduction, Proper motion - Stars with high proper motion, Aberration of light, Double star, Epoch (astronomy), Henderson, Thomas, Kapteyn, Jacobus, List of astronomical topics, Parallax, Star catalogue, Superluminal motion, Timeline of stellar astronomy

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Proper motion - History: Encyclopedia II - Proper motion - History

Proper motion was discovered in 1718 by Edmund Halley, who noticed that Sirius, Arcturus and Aldebaran were over half a degree away from the positions charted by the ancient Greek astronomer Hipparchus roughly 1850 years earlier. In research published in 2005, the first measurement of the proper motion of a galaxy (the Triangulum Galaxy) was made. [1] ...

At first sight, stars seem to be in fixed positions with respect to each other, meaning they always form the same figures, and (for example) Ursa Major looks the same now as forty years ago. More careful observation shows that the constellations change shape very slowly, and that each star has an independent motion. This motion is caused by the true movement of the stars relative to the Sun and solar system through space. It is measured by two quantities: the proper motion angle and the proper motion itself. The first qu ...

Proper motion - History

A Wisdom Archive on Proper motion - History

ARTICLES RELATED TO Proper motion - History

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