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Hipparchus
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Hipparchus was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of the precession of the equinoxes. Hipp
Illustration based on a 19th century engraved amethyst from the Poniatowski gem collection
Illustration based on a 19th century engraved amethyst from the Poniatowski gem collection
The figure on the left may be Hipparchus, from Raphael’s fresco The School of Athens
The figure on the left may be Hipparchus, from Raphael’s fresco The School of Athens
A 19th century artist's impression of Hipparchus
A 19th century artist's impression of Hipparchus
Hipparcos satellite in the Large Solar Simulator, ESTEC, February 1988
Hipparcos satellite in the Large Solar Simulator, ESTEC, February 1988
Ptolemy
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Claudius Ptolemy, better known mononymously as Ptolemy, was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of w
Hipparchus
…Baptiste Joseph Delambre in 1817. Hipparchus was born in Nicaea (Ancient Greek: Νίκαια), in Bithynia. The exact dates of his life are not known, but Ptolemy attributes astronomical observations to him in the period from 147 to 127 BC, and some of these are stated as made in Rhodes; earlier observations since…
Portrait of Ptolemy by Justus van Gent or Pedro Berruguete (1476)
Portrait of Ptolemy by Justus van Gent or Pedro Berruguete (1476)
Engraving of a crowned Ptolemy being guided by Urania, by Gregor Reisch (1508), from Margarita Philosophica showing an early conflation of the mathema
Engraving of a crowned Ptolemy being guided by Urania, by Gregor Reisch (1508), from Margarita Philosophica showing an early conflation of the mathematician with the royal house of Ptolemaic Egypt, with the same last name.
Pages from the Almagest in Arabic translation showing astronomical tables.
Pages from the Almagest in Arabic translation showing astronomical tables.
A depiction of the non-Ptolemaic Universe with no epicycles, possibly from 500 years before Ptolemy, as described in the Planetary Hypotheses by Barto
A depiction of the non-Ptolemaic Universe with no epicycles, possibly from 500 years before Ptolemy, as described in the Planetary Hypotheses by Bartolomeu Velho (1568).