Zhang Heng (Han dynasty)
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| Zhang Heng | |||
|---|---|---|---|
| Traditional Chinese | 張橫 | ||
| Simplified Chinese | 张横 | ||
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Template:Chinese-name Zhang Heng was a military general serving under the warlord Han Sui during the late Han Dynasty period of Chinese history. Once, Ma Chao led an army to attack Cao Cao and started the Battle of Tong Pass. Zhang Heng participated in the battle by joining Ma Chao's side against Cao Cao.
In 120 BC Zhang Heng of the Han Dynasty created a star catalog documenting over 2,500 stars and around 100 constellations. He also wrote a new formula for pi, corrected mistakes in the Chinese calendar, gave reasoning for the existence of a spherical moon that reflects light, and noted that the lunar eclipse occurred when the moon blocks sunlight from reaching earth.
See also
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