, rhyming with daily. As to the surname Halley, Colin Ronan, one of Edmond Halley's biographers, preferred , rhyming with crawly.

Spellings of Halley's name during his lifetime included Hailey, Haley, Hayley, Halley, Haly, Hawley, and Hawly, so its contemporary pronunciation is uncertain, but the version rhyming with valley seems to be preferred by modern bearers of the surname.

Computation of orbit

Halley was the first comet to be recognised as periodic. Until the Renaissance,

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