Key facts, Orbits, Calander of events Halley's Comet:
It's very unusable for an object in the solar system, that Halley's orbit is retrograde; its orbits the sun in the opposite directions the planets, or clockwise from above the sun's north pole.
Reproduced without acknowledgement from "Halley's Comet", A daily guide for Southern Africa by Peter Mack and Sven Sperbund. Copyright Cederberg Absorvatory.