Tomorrow is going to be the longest day of the year – here’s why

Metro

clock gif

This Tuesday is going to be the longest day of the year – as scientists quietly add an extra second at 23.59.59.

We won’t notice, of course – the atomic clocks which control the ones on your phone and your PC will adjust themselves, and everything will go on as normal.

Around the world, atomic clocks will either ‘switch off’ for a second, or go to 23.59.60 before moving on to 00.00.00.

The ‘leap second’ is being added to keep Earth in time with ‘solar time’ – average length of a day, based on how long it takes Earth to rotate.

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‘Earth’s rotation is gradually slowing down a bit, so leap seconds are a way to account for that,’ said Daniel MacMillan of NASA’s…

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