Da Vinci in the West, Zhang Heng in the East...

Guo Moruo, a famous Chinese writer and historian in the 20th century, commented on Zhang Heng: "Such a comprehensively developed figure has never been more important in world history. It is also rare in China, and it is admirable to be worshiped for thousands of years."

Zhang Heng (78-139), courtesy name Pingzi, was born in Xi'e, Nanyang (now Shiqiao Town, Nanyang City, Henan Province), and was of Han nationality. He was a great astronomer during the Eastern Han Dynasty in my country and made indelible contributions to the development of astronomy in my country. Zhang Heng also showed extraordinary talents and extensive knowledge in mathematics, geography, painting and literature.

Zhang Heng is one of the representatives of the Huntian theory in the middle Eastern Han Dynasty; he pointed out that the moon itself does not emit light, but the moonlight is actually the reflection of sunlight; he also correctly explained the cause of lunar eclipses and recognized the universe The infinity and the relationship between the speed of planetary motion and the distance from the earth.

Zhang Heng observed and recorded 2,500 stars, created the world's first leaky armillary sphere that can perform celestial phenomena more accurately, and the first instrument to test celestial phenomena - Hou Feng Seismographs have also been used to create compass vehicles, automatic drum-recording vehicles, wooden birds that can fly several miles, and so on.

Zhang Heng*** authored thirty-two scientific, philosophical, and literary works, including astronomical works such as "Lingxian" and "Lingxian Tu".

In order to commemorate Zhang Heng's achievements, people named a crater on the back of the moon "Zhang Heng Crater" and the asteroid 1802 as "Zhang Heng Asteroid".

Guo Moruo, a famous Chinese writer and historian in the 20th century, commented on Zhang Heng: "Such a comprehensively developed figure is rare in world history. He has been worshiped for thousands of years, which is admirable."< /p>

Later generations called Zhang Heng the Wood Sage (Science Sage). Zhang Heng's courtesy name is Pingzi. A native of Xi'e County, Nanyang County (now Nanyang, Henan Province). He was born in the third year of Jianchu of the Eastern Han Dynasty (78 AD) and died in the fourth year of Yonghe (139 AD). Astronomy, mechanical technology, and chemistry.