名词
中文翻译：朱利安日数
同义词：
['Julian day', 'Julian calendar day例句：1. The Julian day is the date when the sun crosses the equator for the first time.（朱利安日是太阳第一次穿越赤道的日期。）2. The Julian calendar was used in ancient Rome to keep track of the solar year.（朱利安历在古罗马被用来记录太阳年。）']
例句：
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1. The Julian day is the date when the sun crosses the equator for the first time.
朱利安日是太阳第一次穿越赤道的日期。
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2. The Julian calendar was used in ancient Rome to keep track of the solar year.
朱利安历在古罗马被用来记录太阳年。
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3. The Julian day is celebrated as a holiday in many countries around the world.
朱利安日在世界许多国家被庆祝为节假日。