Most Accurate Clock
Discover the World's Most Accurate Clock: The NIST Optical Lattice Clock

Learn about the NIST optical lattice clock, the most precise clock that won't gain or lose a second in 300 million years.

Precise Clock Unveiled
Discover the Most Accurate Clock in the World at NIST

Learn about the world's most precise clock located at NIST in Colorado, losing only one second every 33 billion years.