By the editor
Lhe Earth set a new rotational speed record this Wednesday, June 29, 2022. The day lasted 24 hours minus 1.59 milliseconds. This record is the latest since 2020. There is nothing alarming about this surprising situation, however. Christian Bizouard is an astronomer with the National Earth Rotation Service. Asked by
, he sums up the situation like this: “Since 2016, we have noticed that the speed of rotation of the Earth is accelerating, therefore the length of the day is decreasing. »
He explains that since 1830, the speed of rotation of the Earth was decreasing, and that therefore the days were increasing. For seven years, it’s been the other way around. 2020 recorded the fastest 28 days since 1930. This is a situation that, according to the astronomer, we do not know how to explain.
But this variation does not worry the scientist. Over one or two years, the speed of the Earth’s rotation varies seasonally. Several elements come into play. 80% of the variations are due to the winds in the atmosphere. The tides can also be the cause. No clear observations have been made that could link this phenomenon to climate change.