(30) Returns on record, and the next
Every return
From the first certain record in 240 BC to 1986. The dates are perihelion, when the comet was closest to the Sun; before 1607 they are in the Julian calendar and some are uncertain by a few days.
74.4
Shortest gap in the list, in years: 1835 to 1910.
79.3
Longest gap, in years: 451 to 530. Jupiter and Saturn decide which.
⅛
Of all comet sightings in historical records are of this one comet.