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Other notable achievements of Greek mathematics are conic sections (Apollonius of Perga, 3rd century BC), [82] trigonometry (Hipparchus of Nicaea, 2nd century BC), [83] and the beginnings of algebra (Diophantus, 3rd century AD). [84] The numerals used in the Bakhshali manuscript, dated between the 2nd century BC and the 2nd century AD
An animation showing a low eccentricity orbit (near-circle, in red), and a high eccentricity orbit (ellipse, in purple). In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object [1] such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such ...
A section of yew (Taxus baccata) showing 27 annual growth rings, pale sapwood and dark heartwood. ... [130] is the practice of growing and shaping small trees, ...