File:Eratosthenes.svg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search
Original file(SVG file, nominally 427 × 257 pixels, file size: 102 KB)

Summary[edit]

Description
English: Eratosthenes' measurement of the Earth's circumference.

Syene () is located on the Tropic of Cancer, so that at summer solstice the sun appears at the zenith, directly overhead. In Alexandria () the sun is south of the zenith at the same time. So the circumference of earth can be calculated being times the distance between and .

Erastothenes measured the angle to be 1/50 of a circle and his access to knowledge of the size of Egypt gave a north/south distance between Alexandria and Syene of 5000 stadia. His circumference of the Earth was therefore 250 000 stadia. Certain accepted values of the length of the stadia in use at the time give an error of less than 6% for the true value for the polar circumference.
Date
Source Own work
Author Erzbischof

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
w:en:Creative Commons

attribution share alike

This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

You may select the license of your choice.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current11:32, 14 August 2009Thumbnail for version as of 11:32, 14 August 2009427 × 257 (102 KB)Erzbischof (talk | contribs)removed one layer of earth ;-)
11:26, 14 August 2009Thumbnail for version as of 11:26, 14 August 2009427 × 257 (140 KB)Erzbischof (talk | contribs)Added contour of africa.
17:12, 13 August 2009Thumbnail for version as of 17:12, 13 August 2009427 × 257 (12 KB)Erzbischof (talk | contribs){{Information |Description={{en|1=;Eratosthenes' measurement of the Earth's circumference. Syene (<math>S</math>) is located on the Tropic of Cancer, so that at summer solstice the sun appears at the zenith, directly overhead. In Alexandria (<math>A</math
  • You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file: