常見例句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過天狼星（大犬星的埃及名字）的偕日上升來確定的。Sothic cycle 天狼周Sothic year 天狼年 返回 Sothic