《Tetrabiblos》The PlanetsClaudius Ptolemy（Ashmand 英譯 1822）
He also measured a degree of the meridian, and determined the extent of the earth, by means similar to those adopted by the moderns.
段落 tetra-2-theplanets-93public-domain (Ashmand 1822)
↗ 開啟公有領域原文（Wikisource）此段為公有領域典籍逐字擷取，零 AI 生成；原文亦存繁化前底本，可逐字審計。我們寧可少引、不可錯引——驗不過的引文一律捨棄。