Greenwich time and Sidereal time

Greenwich time noun - The local time at the 0 meridian passing through Greenwich, England; it is the same everywhere.

Sidereal time and greenwich time are semantically related. In some cases you can replace phrase "Sidereal time" with "Greenwich time", this phrases are similar.

Sidereal time noun - Measured by the diurnal motion of stars.

Greenwich time and sidereal time are semantically related. Sometimes you can replace phrase "Greenwich time" with "Sidereal time", this phrases are similar.