heliacal
/hɪˈlaɪəkəl/
adjective
- Relating to or near the sun, especially describing the rising or setting of a star when it is close to the sun.
- The heliacal rising of Sirius marked the start of the ancient Egyptian new year.
- The heliacal appearance of a star can be seen just before sunrise.
- Astronomers observed the heliacal setting of the planet Venus.
Synonyms