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* 5th century BC - The [[Zeno's paradoxes]], * 5th century BC - [[Antiphon (orator)|Antiphon]] attempts to [[Squaring the circle|squar ...

Since antiquity, astronomers have progressively refined the definition of the tropical year. The entry f ...e word "tropical" was lent to the period of the seasonal cycle . The early Chinese, Hindus, Greeks, and others made approximate measures of the tropical year. ...

Astronomers and great thinkers of the past were able to record observations and attempt === Chinese theories === ...

...peared throughout history, including the work of [[Desargues]] in the 17th century, all the way back to the implicit use of [[spherical geometry]] to understa ...the theory of [[manifold]]s and [[Riemannian geometry]]. Later in the 19th century, it appeared that geometries without the [[parallel postulate]] ([[non-Eucl ...

*'''[[Andrey Bolotov]]''', major 18th-century [[agriculturist]], discovered [[dichogamy]], pioneered [[cross-pollination] *'''[[Sergei Chetverikov]]''', pioneer of [[modern synthesis (20th century)|modern evolutionary synthesis]] ...

...[[history of Islam]], traditionally dated from the 8th century to the 13th century.<ref name=Saliba>{{cite book|last=Saliba |first=George |author-link=George ...phor of a [[Golden age (metaphor)|golden age]] began to be applied in 19th-century literature about [[Islamic history]], in the context of the western aesthet ...

...or [[panemone windmill]] first appeared in [[Greater Iran]] during the 9th century.<ref>Glick, Thomas F., Steven Livesey, and Faith Wallis. Medieval science, The 9th century mathematician [[Muhammad ibn Musa al-Khwarizmi]] founded algebra and expand ...