Han China
- Where
- the Han empire, centred on the Yellow River plain
- When
- roughly the second century BCE to the third century CE
- What survives
- Dynastic histories with dedicated astronomical treatises, excavated manuscripts, and dated observational records kept as a function of the state.
2 entries
- The Astronomical Bureau and the Calendar Case
Calendar-making as a prerogative of state, the bureau that did it, and the prosecution of 1664 to 1669 that ended in a shadow measurement.
- The Chinese Lunisolar Calendar
Months set by conjunction, a solar year cut twenty-four ways, the leap-month rule, and the change from equal time to equal solar longitude.