MARK WILLIAMSON / SCIENCE PHOTO LIBRARY MARK WILLIAMSON / SCIENCE PHOTO LIBRARY
A bronze bust of the Chinese astronomer Guo Shoujing (1231-1316) at the Beijing Ancient Observatory, an astronomical observatory that dates from the 1400s. According to an accompanying plaque, he devised a number of astronomical instruments, established several observatories and formulated the Shoushi Calendar which determined the year to be 365.2425 days.
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