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What is the International Atomic Time Scale?

Mardi Gras

"Fat" or Shrove Tuesday

First, determine the date for Easter of any given year (which is the first Sunday after the first full moon that follows the Spring Equinox) and then count back 47 days (40 days of Lent plus Holy Week) to find Mardi Gras Day.

Roman Numerals

Why do clocks use IIII instead of IV for 4?

Still a puzzling choice

British Summer Time

British Summer Time (BST) is the UK name for Daylight Saving Time (DST)

BST is GMT+1 from March till October

From Plot Device to Philosophy : Shakespeare and Time

Measuring Time in the 16th Century

'The Seven Ages of Man' Give Meaning to Each Stage of Life

Solstice and Stonehenge

The magic of midsummer in a magical place

The longest day of the year is called the summer solstice in the Northern Hemisphere

What is the SI unit of time?

Official definition of a second

GMT Timestamp

GMT Server Time Stamp:

Days of the Week

Official European Union Languages

A multi-lingual Monday to Sunday

GMT - Greenwich Mean Time

Global Time Zones - What time is it anywhere in the World?

A cross-check table with GMT offsets

Time Websites

Royal Observatory Greenwich

From sundials to research on time

Time is money?

Bristol Time

What is Bristol Time?

The clock with two minute hands, one is GMT

World Time Zone Map

Map of Global Time Zones

Prime Meridian

Longitude Zero

Agreeing on a universal Prime Meridian was not an easy affair.

UTC - Universal Time Coordinated

What is Coordinated Universal Time?

Leap Second

The adjustment between Atomic & Earth Time

UTC and time scales

BBC Pips

Greenwich Time Signal

For 75 years the major global news headlines of the day have been preceded by the six Greenwich Time 'pips'.  When the news of Neil Armstrong's first steps on the moon , President John F Kennedy's assassination and the destruction of the Berlin Wall were broadcast across the world on the BBC, they followed the familiar sound of the Greenwich pips.

Did Columbus find longitude?

Christopher Columbus

Columbus twice claimed to have found his longitude by timing lunar eclipses. These claims are probably inaccurate.

Name of Months

Month names inevery major European language

A linguist's calendar

Calendar Systems

The systems that sort out the year

The last millennium would have been celebrated in Greenwich, England on 25 March 1001 AD but it wasn't a thousand years ago because we "lost" 11 days along the way!

How GMT is being used today?

Uses of GMT go from email time stamp to air travel

 

When did the millennium begin?

This millennium (and century) officially began on: 1 January 2001 GMT

The simple explanation is that our Calendar System began at 1AD.  There was no year 0.  The calendar we use today goes from 1BC to 1AD.

New Zealand at Autumn Equinox Time

Light, snow and heat

Sundials

History of Sundials

NTP

Network Time Protocol

NTP is a protocol designed to synchronize the clocks of computers over a network. NTP version 3 is an internet draft standard, formalized in RFC 1305. NTP version 4 is a significant revision of the NTP standard, and is the current development version, but has not been formalized in an RFC. Simple NTP (SNTP) version 4 is described in RFC 2030.

Astrology: Natal Chart

The planets at the moment of your birth

Ephemeris and GMT

Time Management Part II

Plans exist to be reviewed. The joy of discarding them

Adding new decisions, taking outdated ones off the list

In tune, on time and in time

Tempo, beats and time signatures in music

What does music teach us about the perception of time?

The Solstice

What is the difference between the Northern and the Southern Hemisphere

Solstice in the UK

All in One: World and Local Clocks

Digital timepieces for real and virtual travel

The World is local, so is the time

NIST

Precise Clock

NIST scientists have built a second "quantum logic clock," using quantum information processing techniques on a single ion of aluminium to make a clock that would not gain or lose more than one second in about 3.7 billion years.  

A.M. and P.M.

Non-abbreviated form: Ante and Post Meridiem

What is Noon and Midnight?

The International Meridian Conference

Washington DC, USA - October 1884

Extract from one of the middle sessions of the Conference:

British Summer Time (BST) Dates 1950-2015

When did summer time start/end ?

Check a particular year for BST start and end

UK Clock Changes and the Anatomy of a Second

GMT, BST, UTC - plus EU legislation

Summer Period - The Full Story

Time and Cricket

A complex relationship

Anna Monks

Panchang - Indian Astrology

Master your time - master your life

Panchang is a system based on Indian astrology, a spiritual and scientific calendar, with very practical aims.

Frequently Asked Questions - FAQs

What is the definition of a second?

As the definition of time evolved, so did the second's

Earth Time and Atomic Time have to be 'reconciled'

Calendars

Measuring Time by Days and Months

Moon Cycles, Solar Years and Seasonal Rhythms

Time Management

It cannot be stored or saved for later. Time can only be managed

We all know the theory of how to use time better, how do we put it in practice?

The International Meridian Conference

Washington DC, USA - October 1884

From pages 199 to 204:

Why is the Navy so involved in time-keeping?

The earliest users of accurate time were the navy

Precision is not optional at sea

Time Ball

What time does the time-ball drop at Greenwich?

In 1833 a red "Time Ball" was installed on the roof of the Royal Observatory Greenwich

Lunar Calendars

Types of lunar calendars observed around the world ,

2016 and 2017 dates

Free Newsletter

Summer Time and Time Zones

Daylight Saving Time (DST) extends beyond the astronomical summer

Civilian designations relative to GMT

Zulu Time

How is it defined?

Zero or Prime Meridian Time

It's official: we're ruled by time

Time is the most popular common noun in English

We like to be punctual, we expect our trains to run to schedule, and many of us spend our working day watching the clock. Now the new revised eleventh edition of the Concise Oxford English Dictionary can officially confirm that we are indeed ruled by time .

WHAT IS TIME?

From Intuition to Classical Physics

Measurement of Time Provides Possible Answers

Railway Time

From natural time to clock time

Railway timetables needed same time convention

Military & Civilian Time Designations

From Time Zone A - Z

There are 25 integer World Time Zones from -12 through 0 (GMT) to +12. Each one is 15° of Longitude as measured East and West from the Prime Meridian of the World at Greenwich, England. Some countries have adopted non-standard time zones, usually 30 minutes offset which have a * designation.

ISO Time

What is the time in ISO format?

A Chinese New Year

The History of Time Zones

Standard Time and Longitudes

24 time zones and many more subdivisions

Global Time

What time is it now across the World?

By using your computer's clock, this calculates the time in other time zones all over the world! Useful if you communicate across different time zones for business or leisure.

Instant time conversion between world locations

How to view local current time differences and GMT offsets

GMT is both a timezone and the reference point for the Prime Meridian

The International Meridian Conference, Washington, 1884

The Prime Meridian at Greenwich becomes the point of reference

Why is Greenwich the "centre of time and space"?

Oxford Time

What is Oxford Time?

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