Chinese Mapped America Before 1430 (Harvard University Archive) Siu-Leung Lee 李兆良 2019.2.10 My research paper presented at the International Cartographic Conference （Washington DC, July 4, 2017）, is now available from Harvard University archive, SAO/NASA ADS ...
希腊数字与欧几里得几何 下面用微软的ChatGPT 测试希腊数字计算圆周。 李： Can you show me how to calculate, using Greek numbers, the circumference of a circle with a radius of 40 m? Chat GPT ： Certainly! The formula for the circumference of a circle is C = 2πr, where r is the r ...
下面几张图提供大家思考。托勒密世界地图，原来地图不存，据说是1482年根据托勒密的数据重绘的。 请注意地图标示的算符数字。 Ptolemy 's world map, reconstituted from Ptolemy's Geography (circa 150) in the 15th century, indicating Sinae ( China ) at the extreme right, ...
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