The most precise clocks in the world will lose only one second every 300 billion years—and someday they might fit in your pocket.

As humans venture farther into the solar system, clocks will need to keep precise time over vast distances. Even tiny errors in timekeeping can lead to navigation errors that grow exponentially ...

Topics covered include principles, measurements, models, the evolution of time definitions, clock time, atomic standards, atomic time, astronomical time, ultra-precise time and frequency standards, as ...

On Nov. 18, 1883, Americans adopted four standardized time zones, replacing a confusing, dangerous hodgepodge of times.

By themselves, tweezer clocks are highly precise at marking the passage of time. In the new study, the researchers have ...

Scientists said they have been "amazed" by how precise the genetic clock is. The study adds to ... animals be in the right place at the right time. "Such fundamental mechanistic understanding ...

Thanks to advances in astronomy, Greek science adapted and perfected Egyptian knowledge to create a time system that divided the day into hours of variable length, depending on the season. These early ...