Search Results: "Ptolemy"

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• 08:14

  What Really Happened to the Library of Alexandria?

  506 views / 0 likes - added 6 years ago

  Picture the Recipe: https://www.youtube.com/channel/UCEBtDzuikFw24LPsgGyW1AQ If you happen to like our videos and have a few bucks to spare to support our efforts, check out our Patreon page where we've got a variety of perks for our Patrons, including Si

• 49:14

  James Burke Connections, Ep. 2 "Death in the Morning"

  516 views / 0 likes - added 4 years ago

  "Death in the Morning" examines the standardisation of precious metal with the touchstone in the ancient world. This innovation stimulated trade from Greece to Persia, ultimately causing the construction of a huge commercial center and library at Alexandr

• 05:22 Popular

  Why Are Planetary Orbits Elliptical?

  825 views / 0 likes - added 3 years ago

  For a very long time, from Ptolemy to the age of Copernicus, it was widely believed and accepted that planets in our Solar System revolved in a perfectly circular path. Because the circle was presumed to be an ideal shape for planetary bodies to orbit. Bu

• 38:28

  A Miraculous Proof (Ptolemy's Theorem) - Numberphile

  288 views / 0 likes - added 3 years ago

  Featuring Zvezdelina Stankova... Want more? Part 2 (bringing in Pentagons and the Golden Ratio) is at: https://youtu.be/o3QBgkQi_HAMore links & stuff in full description below Zvezda's Numberphile playlist: http://bit.ly/zvezda_videosZvezda's webpage: htt

• 05:58

  Betelgeuse Is Destined to Explode as a SupernovaBut When?

  264 views / 0 likes - added 3 years ago

  Long considered one of the brightest stars in the night sky, Betelgeuse has begun to dramatically fade then brighten again for reasons we cant quite pin down. And its caused some people to wonder if it's about to explode. Catch up on Constellations! https

• 04:13

  A short animation: the Copernican Revolution

  173 views / 0 likes - added 1 year ago

  In the 16th century, Nicholai Copernicus proposed a fundamental change to the way we see our place in existence: it is the Sun and not Earth that occupies the physical centre, he said. The Copernican revolution that followed holds many important lessons f

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