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

...th [[Greek numerals]] around 600 BC and became largely extinct by the 16th century.{{sfnp|Chrisomalis|2010|p=185}} After the development of [[Positional notat ...gyptian signs. The first examples of the Greek system date back to the 6th century BC, written with the letters of the [[History of the Greek alphabet#Standar ...

...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 ...

...[[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 ...

...irst orbital launches by country#List of first orbital launches by country|9th country to put a domestically built satellite into orbit]] using its [[safi ...or [[panemone windmill]] first appeared in [[Greater Iran]] during the 9th century.<ref>Glick, Thomas F., Steven Livesey, and Faith Wallis. Medieval science, ...

...the [[seconds pendulum]] (a pendulum with a half-period of one second) one century earlier, but this was rejected as it had been discovered that this length v ...des Archives]]}}, a platinum bar held in Paris. During the mid nineteenth century, following the [[American Revolution]] and [[Decolonization of the Americas ...