Time and Calendar Systems

Definitions and explanations of matters concerning the measurement of time and frequency. Also to be found here is information on the construction of calendars, dates of holidays, feast days etc.

Calendars

* Today's Date
Every calendarial event of the day, plus plenty of good astronomical links.
* Equinoxes & Solstices.
Information on and dates of the equinoxes and solstices from the Royal Observatory Greenwich.
* Main UK Public and Bank Holidays and Dates
A useful and comprehensive list.
* Peter Meyer's Calendar Studies Page
contains a quite amazing amount of information on just about any calendrical system you could think of. Very well-written, too.
* Calendarial Data Sheets
Supplied by the Nautical Almanac Office.
* A Simplified Easter Dating Method
The complete procedure for calculating Easter Sunday dates for all years 326 to 4099 A.D.

Time

* The World Clock
An excellent resource for telling the time around the world. Information on time zones and Daylight Savings Time conventions.
* The Time Scales Division of the US Naval Observatory
Definitions and information on how we measure time.
* A Walk Through Time
A excellent presentation on the evolution of time measurement from the NIST Physics Laboratory
* The NIST Time and Frequency Division Home Page
General information and services to do with the measurement of time and frequency.
* CLOCKS and TIME: FAQ: Origin of Hours and Minutes
An interesting and brief account of the origin of out current time system.
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