- Compute Local Apparent Sidereal Time [IA][Direct] -
An online form. Astronomers use local sidereal time because it corresponds to the coordinate right ascension of a celestial body that is presently on the local meridian.
- Directorate of Time [IA][Direct] -
The U.S. Naval Observatory is the official source of time used in the United States.
- FAQ - Time and Frequency Issues [IA][Direct]
- Greenwich Mean Time (GMT) [IA][Direct]
- International Standard Date and Time Notation [IA][Direct] -
Specifies numeric representations of date and time.
- Long Now Foundation, The [IA][Direct] -
Proposes both a mechanism and a myth: a 10,000-year Clock, as a corrective to the short attention span of contemporary society.
- Mystical World Wide Web Time Grid [IA][Direct] -
Facts and history about time, clocks and folklore of the days of the year, months and seasons.
- NIST Time and Frequency Division [IA][Direct] -
Develops and operates standards of time and frequency
- On Time [IA][Direct] -
The Smithsonian explores the changing ways Americans have measured, used, and thought about time.
- The Times of Our Lives [IA][Direct] -
Explores the meaning of time.
- Time of Internet [IA][Direct] -
Information and curios, news and notions, and Internet sites and services about time measurement (also in Italian).
- Walk Through Time, A [IA][Direct] -
The evolution of time measurement.
- What Time Is It In Indiana? [IA][Direct] -
Learn about the three different time arrangements in the Hoosier State.
- World Book Encyclopedia: Measuring Time [IA][Direct] -
Time is one of the world's deepest mysteries. No one can say exactly what it is. Yet, the ability to measure time makes our way of life possible.
- World Book Encyclopedia: The Seasons [IA][Direct] -
Learn what causes the seasons and what changes accompany each of the four seasons.
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