Starts to the prime meridian, becomes the world coordinates.

本初子午线，世界时间的起点。

Yes this is the…is the prime meridian if you like. The line that separates the eastern hemisphere from the western hemisphere.

是的，这就是本初子午线，它把地球分为东半球和西半球。

The prime meridian is at 0 degrees longitude, and the international date line is at 180 degrees. The equator is at 0 degrees latitude.

本初子午线处于0度经度，而国际日期变更线处于180度经度。赤道处于0度纬度。

Greenwich thus became established as the location of the prime meridian of longitude, and the base line for calculating time zones around the world.

由此格林威治不仅作为起初子午线的所在地，也成为全球计算时区的基准线。

They are the curvature corrections for recording time at the determined zenith distances when a star passes the prime vertical and the meridian circle.

卯酉方向天顶距的星径曲率改正以及子午方向天顶距的星径曲率改正。