Text #24Cometography: A Catalog of Comets. Series: Cometography. Vol. 1 .
The only ancient text reporting this object is the Han shu (100). It says the Chinese saw a “celestial magnolia tree…in the southwest in the evening” on -161 February 6.1 The date and location imply a probable UT of February 6.5.
Wen Shion Tsu (1934) and Yu-Che Chang (1979) both suggested the actual year of the observation was -162, and that this was a previous appearance of 1P/Halley. Chang gave the perihelion date as -162 January 20. In reality, Chang did not consider the effects of nongravitational forces and his orbit was probably not very close to the truth. The computations of other astronomers who have included nongravitational forces indicate a perihelion date sometime during -163 October or November.
Full moon: February 18
This is considered by some to be a record of Comet Halley’s return -28. The term tianchan, “heavenly tree”, is idiosyncratic. [nE] ↩