Measuring time & Atomic clocks

▸ Loading 4 rungs of timekeeping: sundial → pendulum → quartz → atomic…

▸ Calibrating ¹³³Cs: 1 second = 9,192,631,770 oscillations

▸ Enabling accumulated-error comparison (accuracy scale)

▸ Loading GPS + leap seconds…

▸ Online. ✅

Now showing

⏱️ Clock

Drift / day—

Count frequency—

Scenario—

Definition of the second

—

Change the Scenario to view each timekeeping technology · click a technology on the right for details

Accuracy by technology (log scale)accuracy