Copy Reference Zhang Heng Astronomer and Inventor
Year:1989 Issue:1
Column: SCIENCE
Author: STAFF REPORTER CHAI RUIKANG
Release Date:1989-01-01
Page: 60,61
Full Text:
AT THE HEIGHT of the Eastern Han dynasty (A.D. 25-220), a large, water-powered celestial globe was made in Luoyang, the Han capital. Some years later in the same city, what was probably the world's...
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