Ptolemy tells us that Eratosthenes measured the tilt of the Earth's axis with great accuracy obtaining the value of 11/83 of 180, namely 23 51' 15".
Ptolemy Sinasabi sa amin na Eratosthenes sinusukat ang matiwas ng Earth's aksis na may mahusay na kawastuhan makuha ang halaga ng 11 / 83 ng 180, namely 23 51 '15 ".