adj.太陽的；和太陽同時(shí)或幾乎同時(shí)出沒的

The heliacal or sothic year is determined by the heliacal rising of sothis (the Egyptian name for the dog star). 偕日年或天狼星年是通過天狼星（大犬星的埃及名字）的偕日上升來確定的。

This star was the most important of the stars to the ancient Egyptians, and the heliacal rising of this star came at the time of inundation and the start of the Egyptian New Year. 這顆星對(duì)古埃及人來講是最重要的星，而且這顆星與太陽一同升起的時(shí)間就是洪水和埃及新年開始的時(shí)間。

heliacal rising [setting] (of a star) (某一顆星)與太陽同時(shí)升起[降落]

heliacal rising [ setting ](of a star) (某一顆星)與太陽同時(shí)升起[降落]

heliacal rising [setting] (of a star (某一顆星)與太陽同時(shí)升起[降落]

relating to or especially immediately preceding or following the heliacal rising of Canicula (the Dog Star) 關(guān)于天狼星，尤指在天狼星升起前或隨天狼星升起