Proper motion: Quick Facts

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Star stellar motion Parallax Astronomical observatory How Do We Know How Far Away the Stars Are?astrolabe Heliometer Gravitational microlensing Zone of avoidance

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Milky Way Galaxy: Star populations and movement

Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

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