Tien T. Tsong - Academia Sinica
Tien T. Tsong - Academia Sinica
Tien T. Tsong - Academia Sinica
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Hipparchus<br />
2 nd Century BC,<br />
calculated the<br />
length of the year<br />
to within 6 1/2<br />
minutes, compiled<br />
the first known star<br />
catalog, and made<br />
an early<br />
formulation of<br />
trigonometry ( 計<br />
算 一 年 天 數 , 紀 錄<br />
星 譜 , 創 造 三 角 ).<br />
張 衡 ( 東 漢 ,78-139 AD), 地 震 儀 , 渾 天 儀 ~130 AD<br />
<strong>Tien</strong> T. <strong>Tsong</strong>
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