mean time

idiomPart ofmeantime

mean time — idiom

1. a standard for measuring time based on the average motion of the sun across the

1.idiom
Definition

a standard for measuring time based on the average motion of the sun across the sky, used in astronomy and as the basis for civil time zones such as Greenwich Mean Time (GMT).

Example

When the clock at the Greenwich Observatory shows noon (Greenwich Mean Time), it is already 8 p.m. in Singapore.

Before GPS existed, sailors used Greenwich Mean Time to figure out how far east or west they had sailed.