UTC−4 ist eine Zonenzeit, die den Längenhalbkreis 60° West als Bezugsmeridian hat. Auf Uhren mit dieser Zonenzeit ist es vier Stunden früher als die. Zeitzonenrechner GMT. GMT. Aktuelle Uhrzeit. GMT Greenwich Mean Time. Di., 8. Dez. UTC bzw. GMT. Koordinierte Weltzeit Coordinated. Simply mouse over the colored hour-tiles and glance at the hours selected by the column and done! GMT stands for Greenwich Mean Time. Berlin, Germany time.
Aktuelle Zeit: UTC-4, Zeitzoneaktuelle GMT-Zeit auf diesem Server - kann von der amtlichen abweichen. Östlich von Greenwich C*, IRT: Iran, Teheran, Iran. GMT+4 Sat 04 UTC−4 ist eine Zonenzeit, die den Längenhalbkreis 60° West als Bezugsmeridian hat. Auf Uhren mit dieser Zonenzeit ist es vier Stunden früher als die. Exact time now, time zone, time difference, sunrise/sunset time and key facts for GMT
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For those of you who don't operate on Internet Time, this spreadsheet shows the time zone in countries, extracted from our World Factfiles series. Flickr Please post your visualisations and mash-ups on our Flickr group or mail us at datastore guardian.
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News Datablog. Time zones around the world, in every country There are 24 time zones around the world. Find out which one to worry about. Originally, astronomers considered a GMT day to start at noon, while for almost everyone else it started at midnight.
As the United Kingdom developed into an advanced maritime nation , British mariners kept at least one chronometer on GMT to calculate their longitude from the Greenwich meridian, which was considered to have longitude zero degrees, by a convention adopted in the International Meridian Conference of Synchronisation of the chronometer on GMT did not affect shipboard time, which was still solar time.
But this practice, combined with mariners from other nations drawing from Nevil Maskelyne 's method of lunar distances based on observations at Greenwich, led to GMT being used worldwide as a standard time independent of location.
Greenwich Mean Time was adopted across the island of Great Britain by the Railway Clearing House in and by almost all railway companies by the following year, from which the term " railway time " is derived.
It was gradually adopted for other purposes, but a legal case in held " local mean time " to be the official time.
For example, our polling booths were opened, say, at 8 13 and closed at 4 13 p. On 1 January , GMT was superseded as the international civil time standard by Coordinated Universal Time, maintained by an ensemble of atomic clocks around the world.
Universal Time UT , a term introduced in , initially represented mean time at Greenwich determined in the traditional way to accord with the originally defined universal day ; from 1 January as decided by the International Astronomical Union in Dublin in , at the initiative of William Markowitz this "raw" form of UT was re-labelled UT0 and effectively superseded by refined forms UT1 UT0 equalised for the effects of polar wandering  and UT2 UT1 further equalised for annual seasonal variations in Earth rotation rate.
Indeed, even the Greenwich meridian itself is not quite what it used to be—defined by "the centre of the transit instrument at the Observatory at Greenwich".
Although that instrument still survives in working order, it is no longer in use and now the meridian of origin of the world's longitude and time is not strictly defined in material form but from a statistical solution resulting from observations of all time-determination stations which the BIPM takes into account when co-ordinating the world's time signals.
Nevertheless, the line in the old observatory's courtyard today differs no more than a few metres from that imaginary line which is now the prime meridian of the world.
Historically, GMT has been used with two different conventions for numbering hours. The long-standing astronomical convention, dating from the work of Ptolemy , was to refer to noon as zero hours see Julian day.
This contrasted with the civil convention of referring to midnight as zero hours dating from the Roman Empire. The latter convention was adopted on and after 1 January for astronomical purposes, resulting in a discontinuity of 12 hours, or half a day.
The instant that was designated "December Legally, the civil time used in the UK is called "Greenwich mean time" without capitalisation , according to the Interpretation Act , with an exception made for those periods when the Summer Time Act orders an hour's shift for daylight saving.
The Interpretation Act , section 9, provides that whenever an expression of time occurs in an Act, the time referred to shall unless otherwise specifically stated be held to be Greenwich mean time.
Under subsection 23 3 , the same rule applies to deeds and other instruments. For other uses, see GMT disambiguation.
Mauritius Time [b] Seychelles Time [b]. Main article: History of longitude. Greenwich time and the longitude. London: Philip Wilson. UCO Lick.
Retrieved 28 July Lexico UK Dictionary. Oxford University Press. Times, London, England, 14 May The Times Digital Archive.
Stanford University Press. Retrieved 18 August University Science Books. Retrieved 2 December Archived from the original on 25 January Retrieved 27 November Time measurement and standards.
Chronometry Orders of magnitude Metrology. Ephemeris time Greenwich Mean Time Prime meridian.