| 字词 | 天球仪 |
| 释义 | •¶ 中国东汉科学家张衡发明的天球仪是世界上最早的天球仪。 它可以测出太阳和月亮的角直径都是0.5度， 黄赤交角为24度。 The celestial globe invented by Zhang Heng, Chinese scientist of the East Han Dynasty (25 A.D.—220 A.D.), was the first of its kind in the world. It determined that the angular diameter of both the sun and the moon was 0.5° and the obliquity of the ecliptic was 24°. |
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