Greenwich sidereal date

例句：

1. 1. The Greenwich Mean SiderealDate is used to calculate the time differencebetween two locations.
   格林尼治恒星日用于计算两个地点之间的时间差。
2. 2. TheGreenwich Mean Sidereal Date is alsoknown as the Greenwich Mean Time.
   格林尼治恒星日也被称为格林尼治平均时间。
3. 3. The Greenwich Mean Sidereal Date is important for navigation and timingpurposes.
   格林尼治恒星日对于导航和计时非常重要。