среднее время по Гринвичу
всемирное [гринвичское среднее] время
[сокращение] GMT Гринвичское время, (среднее) время по Гринвичу, всемирное время Синоним(ы): Universal Time
noun Usage: often capitalized M&T Etymology: Greenwich, England the mean solar time of the meridian of Greenwich used historically as the prime basis of standard time throughout the world — called also Greenwich time — compare Coordinated Universal Time
(GMT) The local time on the Greenwich meridian, based on the hypothetical mean sun (which averages out the effects of the Earth's elliptical orbit and its tilted axis). GMT is the basis of the civil time for the UK. In 1925 the reference point was changed from noon to midnight and it was recommended that the term "Universal Time" should be used for the new GMT. Authorities disagreed on whether GMT equates with UT0 or UT1, however the differences between the two are of the order of thousandths of a second. GMT is no longer used for scientific purposes.