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* 5th century BC - The [[Zeno's paradoxes]], * 5th century BC - [[Antiphon (orator)|Antiphon]] attempts to [[Squaring the circle|square t ...

...nd the immediate [[Solar System]]. They also discovered many concepts in [[Chinese mathematics|mathematics]]. The list below contains discoveries which found ...ts representing 11 pm to 1 am (left) and 5 am to 7 am (right); the ancient Chinese, although discussing it in supernatural terms, acknowledged [[circadian rhy ...

...actions. The system became the standard of France and Europe within half a century. Other measures with unity ratios<ref group="Note">ratios of 1 between mag ...ts for length, mass and time. Advances in [[electromagnetism]] in the 19th century necessitated additional units to be defined, and multiple incompatible syst ...