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The heliacal rising or setting of a star indicates to within a few days the date in the annual day-cycle. 星辰偕日升降，說明了其在幾天內(nèi)年日循環(huán)的日期。
One of the most famous of all ancient scientific observations was that of the heliacal rising of Sirius which warned the ancient Egyptians of the imminent inundation by the Nile. 古代最有名的一例科學觀測就是，古埃及人通過觀察偕日升降的天狼星，預(yù)測出即將來臨的尼羅河洪災(zāi)。