IPA: /hɪˈlaɪə.kli/
KK: /hɪˈlaɪə.kəl.i/
In a way that relates to the heliacal rising or setting of a star, especially the sun, which occurs just before dawn or just after sunset.
The star appeared heliacally, marking the beginning of the new season.
Heliacally → It is formed from "helios" (ἥλιος) (meaning sun in Greek) and the suffix "-ally" (meaning in a manner). The word "heliacally" refers to something that occurs in relation to the sun, particularly in astronomy.
Think of the Greek word for sun, 'helios', to remember that 'heliacally' means in relation to the sun.