Greenwich

Greenwich Mean Time ( universal time) is a beat system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which posterior became adopted as a global time standard. It is arguably the comparable as Coordinated familiar Time (UTC) and when this is viewed as a time zone the name Greenwich Mean Time is especially utilise by bodies connected with the United Kingdom, such as the BBC World Service,1 the Royal Navy, the Met Office and others particularly in Arab countries, such as the Middle East Broadcasting Center and OSN.It is the term in common accustom in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, Nigeria, India and Malaysia, as well as many other countries in the Old World. Before the introduction of UTC on 1 January 1972 Greenwich Mean Time (also known as Zulu time) was the same as Universal Time (UT) which is a standard astronomical concept utilise in many technical fields. Astronomers no longer use the term Greenwich Mean Time.In the United Kingdom, doh is the official time only during winter during summer British Summer Time is used. GMT is the same as Western European Time. 2 Noon Greenwich Mean Time is rarely the exact moment when the temperateness crosses the Greenwich meridian (and reaches its highest point in the sky at Greenwich) because of Earths uneven speed in its elliptic country and its axial tilt. This event may be up to 16 minutes away from noon GMT (a discrepancy calculated by the equation of time).The fictitious mean sun is the annual average of this nonuniform motion of the true Sun, necessitating the inclusion of mean in Greenwich Mean Time. Historically the term GMT has been used with two different conventions, sometimes numbering hours starting at midnight and sometimes starting at noon. The much specific terms UT and UTC do not share this ambiguity, always referring to midnight as nought hours. Astronomers preferred the latter GMT convention in or der to simplify their observational data so that each entire night was logged under a single calendar date