Ming Astronomical Observatory of the Imperial Astronomy Bureau

Timeline

1. c. 1580–1585Beijing Observatory · BeijingDuring the Wanli era the Imperial Astronomy Bureau continued using the Datong calendar system; the observatory used the armillary sphere to determine stellar positions and the gnomon to measure sun shadows for solar term times. Bureau officials regularly calibrated bronze instrument errors and recorded eclipses, comets, and other celestial phenomena, providing observational basis for the court's calendar promulgation.
2. c. 1582–1590Forbidden City · BeijingThe observatory's calculations were used not only for compiling annual calendars but also to support the bureau in selecting auspicious dates for royal weddings, funerals, sacrifices, and travel; astronomical observation was thus closely bound to imperial ritual politics, becoming a technical guarantee of dynastic legitimacy.
3. c. 1585–1590Beijing · ChinaIn the late 1580s the Imperial Astronomy Bureau still operated entirely on traditional Chinese astronomical systems, but Jesuits in Macau had begun disseminating Western astronomical knowledge; this contact was still in a gestation period, and only after Matteo Ricci entered Beijing in the early 17th century did it spark debate over calendar reform.