Columbia subject headings:
Astronomy, Chinese--History.
Astronomy--China--History.
Xu, Guangqi, 1562-1633.
Harvard subject headings:
Astronomy, Chinese--History
Astronomy--China--History
Xu, Guangqi, 1562-1633.
Princeton subject headings:
Astronomy, Chinese--History.
Astronomy--China--History.
Hsü, Kuang-chʻi, 1526-1633.