Refers to the planet Venus when it appears in the eastern sky before sunrise. Often used poetically or in literary contexts. Synonymous with 明けの明星.
See also: 明けの明星
The morning star was shining in the eastern sky.
Refers to Venus as the evening star, visible after sunset.
Compound of 夜明け (dawn) + の (possessive particle) + 明星 (bright star, specifically Venus). The term is a descriptive phrase for Venus as the morning star.