Question

What do you mean by greenwich mean time ? don't spam​

Answer 1

Answer:

Greenwich Mean Time is the yearly average (or 'mean') of the time each day when the Sun crosses the Prime Meridian at the Royal Observatory Greenwich. Essentially, mean time is clock time rather than solar (astronomical) time.

Answer 2

Answer:

Greenwich mean time is the mean solar time at the royl observatory in Greenwich, London, reckoned from midnight.