基本解释[天文学]偕日落夕没偕日降英汉例句双语例句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，说明了其在几天内年日循环的日期。heliacal setting更多例句词组短语短语heliacal rising and setting 偕日升降heliacal rising or setting 偕日升落heliacal setting更多词组专业释义天文学偕日落夕没偕日降