[Aktungbby]

Unfortunately the Earth does not rotate at exactly a constant rate. Due to various scientific reasons and increased accuracy in measuring the earth's rotation, a new timescale, called Coordinated Universal Time (UTC), has been adopted and replaces the term GMT.

The Navy, as well as civil aviation, uses the letter "Z" (phonetically "Zulu") to refer to the time at the prime meridian.

I love it that GMT (Greenwich Mean Time) is now 'ZULU' time...Talk about Mean: "I say George ol" chap, what's the hour?" "Why Paddy, I thinks it's Zulu Time Ol chum!...and we're about outta that! "