Horology (Time Measurement, Clocks, Calendars)

The science and history of measuring time.

Resources in this category:

The Calendar Zone
http://www.calendarzone.com/

"Celestial Calendars, Cultural & Religious Calendars, Holidays, Millennium Info, Calendar Reform, Today Calendars, Web & Interactive Calendars, Y2K, also Calendar Information, Resources, Indexes & Directories, Calendar Software."

Calendars through the Ages
http://www.webexhibits.com/calendars/

A site covering the "history of the human endeavor to organize our lives in accordance with the sun and stars." Discover the origins of modern and past calendar systems. This site covers the calendars of several different cultures and includes a timeline of calendar facts.

Clockworks: From Sundials to the Atomic Second
http://www.britannica.com/clockworks/

Clockworks is an animated historical exhibit of the many devices that have been created to measure time. Starting with the sundial and continuing to the modern-day quartz watch and cesium atomic clock, the exhibit chronicles man's endeavor to measure the passage of time. The exhibit features Quicktime movies and has a text-only version.

Internet Clocks, Counters, and Countdowns
http://www.panaga.com/clocks/clocks.htm

A collection of Internet clocks, counters, countdowns, and timers. Current time, international clocks, alternate time systems, national debt, world and US population, death, military spending, doomsday, sun, millenium, and other clocks. Also has a section on clock and counter programming code.

Mystical World Wide Web Time Grid
http://www.mystical-www.co.uk/time/

"This section of Mystical-WWW examines the global concept of Time, Days, Months and Seasons, covering festivals, myths, legends and much more."

The 10,000 Year Calendar
http://www.calendarhome.com/tyc/

A perpetual calendar; allows users to check days of the week for dates in history and in the future. Browsable, not searchable, but easy enough to use.

Ultrasonics Ferroelectrics Frequency Control
http://www.ieee-uffc.org/fcmain.asp

Research essays and review papers dealing with the History of Frequency Control and Timekeeping and tutorials dealing with clocks and oscillators.

Virtual Perpetual Calendars
http://www.vpcalendar.net/

A site that currently provides the calendar for any year in the 19th-21st centuries. You can also look up the dates for holidays in the United States and Canada from 1995-2010. Other features include a quick reference to signs of the zodiac and seasons of the year along with their corresponding dates.

A Walk Through Time
http://physics.nist.gov/GenInt/Time/time.html

Brief history of timekeeping and clocks.

The World Clock
http://www.timeanddate.com/worldclock/full.html

The current time at over 500 locations worldwide. It can be customized to show only the cities you want.

World Time Server
http://www.worldtimeserver.com/current_time_in_HR.aspx

"Provides correct current times in any country or major city along with a global map to help you place the location geographically. World Time Server makes accurate adjustments for current daylight savings time rules in each location and also provides a future event planner to help with time conversion between locations."