astrolabe: Quick Facts

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Rete side of an iron astrolabe made after 1582.

Bartolomeu Dias

Astrolabe, 11th century.

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planisphere Danjon astrolabe prismatic astrolabe alidade linear astrolabe climate rete Astronomical observatory Heliometer Parallax How Do We Know How Far Away the Stars Are?Proper motion Gravitational microlensing Zone of avoidance

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Clock face of Big Ben.

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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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