Halley's Comet: AD 1986 to 2647 BC

Details Halley's Comet: AD 1986 to 2647 BC Halley's Comet: AD 1986 to 2647 BC

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jbaa...92..209b&link_type=abstract

Journal of the British Astronomical Association, vol.92, no.5, p.209-215

Astronomy and Astrophysics

Astronomy

4

Scientific paper

In earlier predictions of the apparitions of Halley's Comet, a three- or four-day error, always with the same sign, has appeared consistently. By adding a secular term to the Newtonian equations of motion it has been possible to link the apparitions of 1910, 1835, 1759 and 1682 with a continuous numerical integration. This backward integration not only represents the last four apparitions but also remains remarkably close to the observed times of perihelion passage for more than 2000 years. The times of perihelion passage are compared to observed or derived dates back to 87 BC, and apparitions prior to 87 BC are compared with historical references whenever they could be found. The starting values of this long integration have been used to make a forward integration and to predict the 1986 return.

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