HONG KONG: Short on time? Don’t worry. This month you’ll get an extra second.A “leap second” will be added on June 30 at midnight Coordinated Universal Time (or 8 p.m. EDT). Leap seconds are added occasionally to help keep the atomic clock synced up with the earth’s rotation.
“The earth’s spin isn’t uniform, it’s not constant,” Nick Stamatakos, the chief of earth orientation parameters at the United States Naval Observatory, told USA TODAY Network.
Because of the earth’s inconsistent speed, scientists in the 1950s created an atomic clock to keep precise track of time. However, as the earth’s rotation sped up and slowed down, the atomic clock continued steadily ahead and the two time indicators grew farther apart.
To fix that inconsistency, scientists then created the UTC (Coordinated Universal Time) to help bridge the gap between the earth time and the atomic clock. However, the atomic clock continues to race ahead, so at least once every 10 years scientists add an extra second to the UTC to keep them closer together. It’s particularly important for things like GPS navigation, Stamatakos said.
“The GPS will tell a user where his location is relative to the GPS spacecraft,” he said. In order to do that, the GPS spacecraft has to know time very accurately and that time has to incorporate the earth speeding up and slowing.
“If you don’t know the time accurately you can mistake where you are and your speed,” according to Stamatakos.
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