heliacal setting
基本解释
- [天文学]偕日落夕没偕日降
英汉例句
- 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。
双语例句
词组短语
- heliacal rising and setting 偕日升降
- heliacal rising or setting 偕日升落
短语
专业释义
- 偕日落
- 夕没
- 偕日降