Ancient Babylonians Used Geometry to Track Jupiter. Left: Cuneiform tablet with calculations involving a trapezoid. Right: The distance travelled by Jupiter after 60 days, 10º45', is computed as the area of the trapezoid. The trapezoid is then divided into two smaller ones in order to find the time (tc) in which Jupiter covers half this distance.

[PC: Trustees of the British Museum/Mathieu Ossendrijver]
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