(Askeri) GREENWICH SAATİ: Greenwich meridyenine göre ortalama güneş saati. Greenwich saatinde gün, gece yarısından sonra sıfır saatte başlar. (0001-2400 e kadar) dört rakamla ifade edilir. "Universal time" da denir. Ayrıca bakınız: "Zulu Time"
(Askeri) GREENWICH BÖLGE SAATİ: Saat bölgesi haritalarında gösterildiği gibi, Greenwich'in doğu ve batısındaki bir coğrafi bölgede bulunan ve bir harf eki ile belirtilen saat
a time signal transmitted on radio by the BBC every hour and consisting of five short beeps followed by a longer one, with the longer one coinciding with the start of the hour
see GMT. GMT the time as measured at Greenwich in London. Former name for mean solar time of the longitude (0°) of the former Royal Observatory at Greenwich, England, or Greenwich meridian. GMT was used to avoid potentially confusing references to local time systems (zones). In accord with tradition, 0000 GMT (denoting the start of a solar day) occurred at noon. In 1925 the numbering system for GMT was changed so that the day (like the civil day) began at midnight. Some confusion resulted, and in 1928 the International Astronomical Union changed the designation of the standard time of the zero meridian to Universal Time, which remains in general use. The term GMT is still used for some purposes (including navigation) in English-speaking countries