PICRYL
PICRYL

The World's Largest Public Domain Source

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[Crowned Greek astronomer Ptolemy and his Renaissance translator Regiomontanus, seated beneath an armillary sphere and surrounded by decorated border]

[Crowned Greek astronomer Ptolemy and his Renaissance translator Regiomontanus, seated beneath an armillary sphere and surrounded by decorated border]

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Exploreactive 2nd century

Explorearmillary sphere

Exploreregiomontanus