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...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 ...irst practical realisation of the metric system came in 1799, during the [[French Revolution]], after the existing system of measures had become impractical ...

...r designed by a commission assembled by Pope Gregory XIII in the sixteenth century."}}{{efn|Many countries that use other calendars for religious purposes use ...ays; when Russia and Greece did so (for their civil calendars) in the 20th century, the jump was 13 days. For other countries and territories, see [[List of a ...

...enturies when a rigorous symbolic formalism was developed. In the mid-19th century, the scope of algebra broadened beyond a [[theory of equations]] to cover d ...[[polynomial equations]] in view of solving them. This changed in the 19th century{{efn|These changes were in part triggered by discoveries that solved many o ...

...ysics)|period]] of [[Cepheid]] [[variable stars]] at the beginning of 20th century. :[[Merieme Chadid]] is a French and Moroccan astronomer and explorer who discovered hypersonic shock waves ...

...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 ...

...teseerx=10.1.1.58.8477 |s2cid=13387519 }}</ref> by [[Paolo Uccello]]. 15th century]] ...List of mathematical artists|Artists have used mathematics]] since the 4th century BC when the Greek [[sculpture|sculptor]] [[Polykleitos]] wrote [[Polykleito ...

| named_after = Latin {{lang|la|Neptunus}}, via French {{lang|fr|Neptune}} ...Neptune|remaining moons]] were located telescopically until the 20th&nbsp;century. ...

This was probably a vain hope; even today economists and economic historians cannot agree about what is the correct theory of money. [[Wolfgang Streeck] ...Charles Tilly]]). Almost all socialist countries that appeared in the 20th century arose out of wars. ...

...mented battle in the history of the world is the [[Battle of Megiddo (15th century BC)|Battle of Megiddo]].<ref name="Dupay">Trevor N. Dupuy, ''Evolution of W * [[Catapult]] — A Catapult dating to the 19th century B.C was found on the walls of the fortress of [[Buhen]].<ref name="wac">{{C ...

...m, as well as to various movements of the late 19th century and early 20th century such as [[Luminism (American art style)|American]], [[Belgium|Belgian]], an ...lso the variant of the urban landscape, frequent especially since the 20th century, in which a factor to take into account is the artificial illumination of t ...

...of the House of Representatives to honor the life and achievements of 19th Century Italian-American inventor Antonio Meucci, and his work in the invention of ...designed by [[Mario Calderara]] and financed by [[Ambroise Goupy]] at the French firm [[Blériot Aéronautique]].<ref>Mario Calderara, Commander Calderara Gla ...