Everyone's heard of leap years ... but what about leap seconds? Young scientists get acquainted with one of humankind's most awkward standard measurements with a short video from a PBS playlist covering space and time measurement. The resource discusses why leap seconds are occasionally added to our day, the many ways the length of a second has been determined, and how Earth's rotation governs our measurement of time.
- Add the video to a time-related lesson plan or to enhance a study of Earth's rotation
- Have the class research and compare atomic clocks to the standard digital and analog clocks found in most classrooms
- Pupils should be aware of standard units of measurement and some basic information about how Earth rotates on its axis to better understand the video
- Despite its complicated nature, the resource presents the content clearly and concisely
- Illustrations and printed text help viewers connect the various ideas about time measurement in the video