78 CE–139 CE
Zhang Heng
Science · Personas científicas · Astronomía · Matemáticas
An Eastern Han scholar who worked in astronomy, mathematics, and technology. His career connects celestial observation, calendrics, and court administration rather than reducing it to a single invention.
Precision, calendar, and review
- Start
- year · no uncertainty qualifier in this record
- End
- year · no uncertainty qualifier in this record
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: life span.
Sources
- mathshistory.st-andrews.ac.uk (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
This record is an editorial synthesis. Consult the sources to check claims and their limits. Chronological relationships alone do not establish causation.