Activity
Other

The Official U. S. Time

For Students 9th - 10th
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...
Article
Khan Academy

Khan Academy: Timekeeping

For Students 9th - 10th
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...
Handout
Institute for Dynamic Educational Advancement

Our Year

For Students 3rd - 8th
The concept of a year in time and the various kinds of year used in human timekeeping are discussed.