File:South African Geology - Schwarz - 1912 Fig 1.png
South_African_Geology_-_Schwarz_-_1912_Fig_1.png (330 × 503 pixels, file size: 3 KB, MIME type: image/png)
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English: Figure from South African Geology - Schwarz - 1912
Fig. 1. Eratosthenes' Measurement of of the Globe' The sun's rays being parallel, when the sun is vertical at Assuan, A, the walls of houses will throw shadows at Alexandria, B. The angle the sun's rays make with the walls of the houses is equal to the angular distance ACB. Knowing the distance AB, this divided by the number of degrees of the angle ACB and multiplied by 360 gives the length of the circumference of the globe. (Page 20) |
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| Source | https://commons.wikimedia.org/wiki/File:South_African_Geology_-_Schwarz_-_1912.djvu |
| Author | Schwarz, Ernest Hubert Lewis, 1873-1928 |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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