Pronunciation
Comet Halley is commonly pronounced /ˈhæli/, rhyming with valley, or more recently /ˈheɪli/, rhyming with daily. Spellings of Edmond Halley's name during his lifetime included Hailey, Haley, Halley, Hawley, and Hawly, so its correct pronunciation is uncertain.
Read more about this topic: Halley's Comet