time for Earth to make a complete rotation on its axis; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day" 同义词：day, twenty-four hours, twenty-four hour period, 24-hour interval, mean solar day,
例句与用法
1.
A sidereal day is about 4 minutes shorter than a solar day . 一个恒星日比一个太阳日大约短4分钟。
2.
Mean solar day 平太阳日平均太阳日
3.
Due to the revolution of the earth , a solar day is longer than a sidereal day 由于地球公转的关系，一个太阳日比一个恒星日长。
4.
They tracked natural cycles : the solar day , the lunar month and the solar year 他们遵循自然的循环：太阳日、太阴月，还有太阳年。
5.
This is exactly how the sundial works . this defines the solar day ，利用太阳投影位置量度时间的日晷，便是根据这个定义运作的计时仪器。
6.
Approximately , a year has 365 solar days but 366 sidereal days . do you know why 一年中大约有365个太阳日，但却有366个恒星日，你知道原因吗？
7.
He is the first known astronomer on that continent to have used a continuous system of counting solar days 他是所知的第一位南亚次大陆天文学家使用持续的系统去计算太阳日。
8.
Thus , as the lunar month is only about 29 1 / 2 solar days , the tithi does not coincide with the natural day ( ahoratra ) 因此，太阴月只不过是相当于大约291 / 2个太阳日，提泰并没有与自然日（阿豪拉塔）相符。
9.
We say approximately because a year has 365 . 2422 solar days . to compensate the extra 0 . 2422 days , some years will have 365 days while some years , called leap years 为了避免长久累积这0 . 2422日而出现误差，我们有4年一闰的解决办法，普通年是365日，但
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