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Horology is the science & survey of timekeeping devices. Clocks and watches are examples of instruments utilized to measure period.

Horology has an extended history & there are numbers of museums devoted to it. An lesson is the Royal Greenwich Observatory, which is also a source of the Prime Meridian, longitude 0° 0' Cypher".

Horology.com
Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.

Horology - A Great Hobby
A very basic introduction to how electric clocks work, with animated pictures. Also a collection of cheap electric clocks with pictures and descriptions.

Antique Horology
The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.

Leap Year Frequently Argued Questions
A humorous approach towards explaining the nature of leap years, in particular why 2000 is a leap year.

How Stuff Works: Time
Complete five-part explanation of time and how it is measured, including information about clocks, time zones, calendars, BC and AD.

On Time
The Smithsonian Institute's exhibition on the changing ways we have measured, used, and thought about time over the past three hundred years.

How The Days of the Week Got Their Names
A short history of the week and each day of the week.

Louis Essen
Autobiography of the physicist who built the world's first operational atomic clock.

"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan
Website of Antica Orologeria Zamberlan, Italy. Extensive technical and historical explanation of the restoration and controversy of the "Orologio" Tower at St. Mark's Square, Venice.

Online Clock Building
Watch a master clockmaker building a clock movement from scratch. Hundreds of photos and drawings, plus a complete description of the process and CAD plans.


Reference: Time: Alternative Systems






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