heliacal rising
/hiːˈlaɪəkəl/noun
- the rising of a celestial object at the same time as the sun, or its first visible rising after a period of invisibility due to conjunction with the sun. The last setting before such a period is the heliacal setting.偕日升。
词源
early 17th cent.: heliacal, via late Latin from Greek hēliakos （from hēlios 'sun'） + -AL.