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A global timekeeping problem postponed by global warming

The historical association of time with the rotation of Earth has meant that Coordinated Universal Time (UTC) closely follows this rotation1. Because the rotation rate is not constant, UTC contains discontinuities (leap seconds), which complicates its use in computer networks2. Since 1972, all UTC discontinuities have required that a leap second be added3. Here we show that increased melting of ice in Greenland and Antarctica, measured by satellite gravity4,5, has decreased the angular velocity of Earth more rapidly than before. Removing this effect from the observed angular velocity shows that since 1972, the angular velocity of the liquid core of Earth has been decreasing at a constant rate that has steadily increased the angular velocity of the rest of the Earth. Extrapolating the trends for the core and other relevant phenomena to predict future Earth orientation shows that UTC as now defined will require a negative discontinuity by 2029. This will pose an unprecedented problem for ....

United States , United Kingdom , District Of Columbia , Us Department Of Commerce , American Astronautical Society , From Earth Rotation , Atomic Physics , Improved Earth , Solid Earth , General History , Geophysical Discussion , Resolving Munk , Civil Timekeeping , Climate Change , Physical Science , Sixth Assessment Report , Intergovernmental Panel , Hill Brown Theory , Its Coming To Be , Short Lived Ascendancy , Core Dynamics , Celestial Navigation , Royal Observatory , Nautical Almanacs ,

Preview: the Elite Dangerous Odyssey FPS expansion is best when you're not shooting


Published
13 Apr, 2021
There s a Vulture circling overhead. Not a scavenger bird, but the somewhat larger Core Dynamics Vulture. Its engine reverbs across the moon s surface as it boosts off into orbit, ignoring me. I m not worth the hassle. My Sidewinder, the trash-tier space banger of Elite Dangerous, is parked quiet and unoccupied on the edge of a huge meteor crater. I m out for a walk, you see, with the long-awaited space legs of the upcoming Odyssey expansion. Not everything is smooth and picturesque in this ongoing public alpha. Despite that, it s gratifying to boot up your favourite space-trucking game and find not just a walking simulator inside, but a moon-walking simulator. ....

Core Dynamics , Elite Dangerous , கோர் இயக்கவியல் , உயரடுக்கு ஆபத்தானது ,