However, according to Time and Date, the recent acceleration in the No planet b stick to plan a be ecological world save earth hot Shirt rotation of the Earth makes scientists talk about a negative leap second for the first time. Instead of an extra second, they may need to subtract one. That’s because the average length of a day is 86,400 seconds, but the average sidereal day in 2021 will be less than 0.05 milliseconds. Throughout the year, that would add a 19-millisecond delay to atomic time.
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Physicist Peter Whibberley of the National Laboratory of Physics in the UK told The Telegraph: “It would be possible for a second negative leap second to increase Earth’s rotation speed, but it is too early to say. happened or not. “There are also international discussions going on about the future of leap seconds, and it is also possible that the need for a leap second could drive the leap-second decision well.”
Astronomically speaking, 2020 is already faster than usual (hinting a sigh of relief). According to Time and Date, Earth has broken the previous record for the shortest sidereal day, set in 2005, 28 times. That year’s shortest day, July 5, saw Earth complete a rotation of 1.0516 milliseconds faster than 86,400 seconds. The shortest day in 2020 is July 19, when the No planet b stick to plan a be ecological world save earth hot Shirt planet completes a rotation of 1,4602 milliseconds faster than 86,400 seconds.
The fastest 28 days on record (since 1960) all occur in 2020 when the Earth completes revs around its axis faster than milliseconds faster than the average. That’s not particularly alarming – the planet’s rotation is always slightly changing, driven by changes in atmospheric pressure, wind, ocean currents, and core movement. But it’s inconvenient for international chronographs, who use ultra-accurate atomic clocks to measure the Coordinated Universal Time (UTC) where people set the clock. When the sidereal time, set as the time it takes Earth to make a full rotation, deviates from UTC by more than 0.4 seconds, the No planet b stick to plan a be ecological world save earth hot Shirt UTC will be adjusted.
So far, these adjustments have included adding a “leap second” to the year at the end of June or December, bringing the sidereal and atomic time back into line. These leap seconds are resolved because the general trend of Earth’s rotation has slowed since precise satellite measurements began in the late 1960s and early 1970s. According to the National Institute of Standards and Technology ( NIST), since 1972, scientists have been adding leap seconds by about a year and a half. The last addition came in 2016 when on New Year’s Eve at 23:59 and 59 seconds, a “leap second” was added.