Other
The Official U. S. Time
Get the official U.S. time from the official U.S. timekeepers, the National Institute of Standards and Technology (NIST), and its military counterpart, the U.S. Naval Observatory. Java needs to be enabled to see the timeclocks. There are...
Khan Academy
Khan Academy: Timekeeping
Why do we need calendars and clocks? To survive in this complex society, you need to track what others are doing and when they're doing it. You also need to know what's happening in the natural world. This article discusses how/why...
Institute for Dynamic Educational Advancement
Our Year
The concept of a year in time and the various kinds of year used in human timekeeping are discussed.