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History
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19th century engraving based on an engraved amethyst from the Poniatowski gem collection
19th century engraving based on an 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
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The Antikythera mechanism was an analog computer from 150–100 BCE designed to calculate the positions of astronomical objects.
The Antikythera mechanism was an analog computer from 150–100 BCE designed to calculate the positions of astronomical objects.
Anaximander
Anaximander
Aristarchus's 3rd-century BCE calculations on the relative sizes of (from left) the Sun, Earth and Moon, from a 10th-century CE Greek copy
Aristarchus's 3rd-century BCE calculations on the relative sizes of (from left) the Sun, Earth and Moon, from a 10th-century CE Greek copy
Greek equatorial sun dial, Ai-Khanoum, Afghanistan 3rd-2nd century BCE.
Greek equatorial sun dial, Ai-Khanoum, Afghanistan 3rd-2nd century BCE.