光的传播。希腊人Erathostene(公元前3世纪)利用夏至那天的太阳阴影计算出地球的半径。1925年的匿名插图。私人收藏。(Light Propagation: Greek Erathostene (3rd century BC) calculated the radius of the earth using the shade of the sun on the day of the summer solstice. Anonymous illustration from 1925. Private collection.)匿名匿名 |
€ 98.15
Enthält 0% MwSt.
|
日期不详 · Engraving
· 图片ID: 925409
Private Collection / Bridgeman Images |
0 评测 |