What is the difference between greenwich time and zulu time?
Zulu time and Greenwich Mean Time are the exact same thing, as is typical of the military, it coined its own term. Since Greenwich is the site of the “zero meridian,” they called GMT “Zero Time” or simply “Z- Time.” In the phonetic alphabet that the flyers of the time used to make themselves understood on their radios, “Z” became “Zebra.” When the alphabet was changed, the call sign became “Zulu.