On June 29, Earth recorded its shortest day since the adoption of the atomic clock. Scientists say this is a normal fluctuation.
since the adoption of the atomic clock standard in 1970 — at 1.59 milliseconds less than 24 hours — scientists say this is a normal fluctuation.
Some Twitter users responded to these tweets with jokes, as well as skepticism about the magnitude of the measurement. Others, however, voiced worries about how it would affect them. Andrew Ingersoll, an emeritus professor of planetary science at the California Institute of Technology, agreed with this assessment.
Scientists in the 1960s began working with atomic clocks to measure time more accurately. The official length of a day, scientifically speaking, now compares the speed of one full rotation of the Earth to time taken by atomic clocks, Merkowitz said. If those measurements get too out of sync, the International Earth Rotation and Reference Systems Service, an organization that maintains global time, may fix the discrepancy by adding a leap second.
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