恒星日 meaning in English

day; sidereal
equinoctial day
sidereal day
star day

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。
Sidereal rotation period
恒星日长度
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。
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？