UTC is based on
A) very precise pendulum motion in Greenwich, U.K.
B) Big Ben
C) average time calculations from atomic clocks collected worldwide
D) the pulse rate of pulsar stars.

Question

Quizplus · Accepted Answer

UTC (Coordinated Universal Time) is based on average time calculations from atomic clocks collected worldwide. It is kept in sync with Universal Time (UT) which is based on the Earth's rotation, but also takes into account variations in the Earth's rotation by adding leap seconds as needed.

UTC Is Based on