Timezone select for America. Adak GMT ; Anchorage GMT -9; Anguilla GMT -4; Antigua GMT -4; Araguaina GMT -3; Argentina - Buenos Aires GMT Uhrzeit jetzt in koordinierter Weltzeit (Coordinated Universal Time, UTC-4). Aktuelle Zeitzone. UTC UTC/GMT -4 Stunden. Keine Sommerzeit im Jahr Lange Zeit wurde die Greenwich-Mean-Time als Weltzeit geführt, heutzutage übernimmt die „Koordinierte Weltzeit“ UTC diese Aufgabe. Aktuell.
Aktuelle Zeit: UTC-4, ZeitzoneMoonset · Moon Phases · Eclipses · Night Sky. am MSK+1. Friday, December 4, MSK+1. UTC/GMT +4 hours. No Daylight Saving Time in Receive DST reminders for (UTC/GMT). AddHO. Zeitzonenrechner GMT. GMT. Aktuelle Uhrzeit. GMT Greenwich Mean Time. Di., 8. Dez. UTC bzw. GMT. Koordinierte Weltzeit Coordinated.
Gmt +4 Greenwich Mean Time VideoHow to use a GMT Watch Function - Rolex GMT-Master II - Crown \u0026 Caliber
The term GMT should not thus be used for certain technical purposes requiring precision. Because of Earth's uneven angular velocity in its elliptical orbit and its axial tilt , noon GMT is rarely the exact moment the Sun crosses the Greenwich meridian and reaches its highest point in the sky there.
This event may occur up to 16 minutes before or after noon GMT, a discrepancy calculated by the equation of time. Noon GMT is the annual average i.
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For example, our polling booths were opened, say, at 8 13 and closed at 4 13 p. On 1 January , GMT was superseded as the international civil time standard by Coordinated Universal Time, maintained by an ensemble of atomic clocks around the world.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 development of the world wide web in the s led to calls for a standardised internet time, as people in cyberspace were no longer bound by geography.
Swatch even invented a concept called beat time that split each day into 1, beats on a decimal system, eradicating time zones entirely. 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.
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Jump to content [s] Jump to comments [c] Jump to site navigation  Jump to search  Terms and conditions . News Datablog. 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. Several countries define their local time by reference to Greenwich Mean Time.
Greenwich Mean Time is used as standard time all year round in the following countries and areas:. Since legal, political, social and economic criteria, in addition to physical or geographical criteria, are used in the drawing of time zones, actual time zones do not precisely adhere to meridian lines.
Following is a list of the incongruencies:. From Wikipedia, the free encyclopedia. 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.6/7/ · GMT is a time offset that subtracts 4 hours from Greenwich Mean Time (GMT). It is observed in the AMT, AST, BOT, CLT, COST, FKT, GYT, PYT, VET during standard time, and in the CDT, EDT during the other months (Daylight saving time).. Some locations use it year-round. In the UTC standard, there is a commitment to keep within seconds of GMT, so that every few years a leap second is applied to UTC. In the age of the internet, these small clock calibrations are conveniently distributed via NTP. UTC/GMT+4 is 4 hours ahead of Greenwich Mean Time (GMT). GMT -4 Time (GMT-4) to Your Local Time and Worldwide Time Conversions, Conversion Time Chart between GMT -4 Time and Local Time. Download as PDF Printable version. Retrieved 28 July Einfach Nur Puzzle Article Talk. For other uses, see GMT disambiguation. Kinder Denkspiele of the chronometer on GMT did not affect shipboard time, which was still solar time. The Times Digital Archive. Time zones around the world, in every country There are 24 time zones around the world. Swatch even invented a concept called beat time that split each day into 1, beats on a decimal system, eradicating Rtl Kostenlos Online zones entirely. Lexico UK Dictionary. The latter convention was adopted on and after 1 January for astronomical purposes, David Dao in a discontinuity of 12 hours, or half a day.