PBS Space Time Season 2015 Episode 24 The Leap Second Explained

In the PBS Space Time season 2015 episode 24 titled "The Leap Second Explained," the hosts dive into the complex world of timekeeping and the leap second. The episode begins with a brief history of timekeeping, from the use of sundials and water clocks to the development of atomic clocks. The hosts then explain that atomic clocks keep incredibly precise time by measuring the vibrations of atoms, but they do not always match up with the rotation of the Earth.

This mismatch between atomic time and Earth time leads to the need for leap seconds. The hosts explain that a leap second is added to atomic time every so often to keep it synchronized with Earth's rotation. They then delve into the science behind the leap second, explaining how it is determined when a leap second should be added and how it is implemented.

Throughout the episode, the hosts break down the leap second in an accessible and entertaining way, using animations and visuals to help illustrate the science behind it. They also discuss the potential consequences that could occur if leap seconds were not added, including the drifting apart of atomic and Earth time, which would have disastrous effects on modern technologies that rely on precise timekeeping.

The episode concludes by discussing the ongoing debate over the use of leap seconds and the possibility of abandoning them altogether. The hosts weigh the pros and cons of this decision, highlighting the potential benefits of a consistent and stable atomic time system, but also cautioning against the long-term consequences of losing the connection between atomic time and Earth's rotation.

Overall, "The Leap Second Explained" is a fascinating and informative episode that takes viewers on a journey through the history of timekeeping and the complex science behind the leap second. Viewers will come away with a new appreciation for the importance of precise timekeeping and the role that leap seconds play in keeping our world running smoothly.