pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun;
"the heliacal rising of the Dog Star" "the heliacal or Sothic year is determined by the heliacal rising of Sothis (the Egyptian name for the Dog Star)"
例句
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过天狼星（大犬星的埃及名字）的偕日上升来确定的。
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. 这颗星对古埃及人来讲是最重要的星，而且这颗星与太阳一同升起的时间就是洪水和埃及新年开始的时间。
heliacal rising [setting] (of a star) (某一颗星)与太阳同时升起[降落]
heliacal rising [ setting ](of a star) (某一颗星)与太阳同时升起[降落]
heliacal rising [setting] (of a star (某一颗星)与太阳同时升起[降落]
relating to or especially immediately preceding or following the heliacal rising of Canicula (the Dog Star) 关于天狼星，尤指在天狼星升起前或随天狼星升起
