Unfortunately, I squandered it by posting this post one minute early. Sorry.
Why Time Will Stop For a Leap Second
National Geographic | June 26, 2015
Just as leap years keep our calendars lined up with Earth’s revolution around the sun, leap seconds adjust for Earth’s rotation.
This kind of fine-tuning wasn’t much of an issue before the invention of atomic clocks, whose ticks are defined by the cycling of atoms.
Cesium-based clocks, one kind of atomic clock, measure the passage of time much more precisely than those based on the rotation of our planet, so adding a leap second allows astronomical time to catch up to atomic time.
Most of us won’t notice the addition, which happens at 23:59:59 coordinated universal time (UTC), or 7:59 p.m. ET, unless we deal in timescales shorter than a second, or if we use a computer program that crashes because it can’t handle the leap second.
It’s happened before: The 2012 leap second brought down Reddit, Gawker Media, and Mozilla.
“It’s a major interruption mostly because there are a lot of systems that aren’t prepared to handle the leap second correctly,” says Judah Levine, a physicist at the National Institute of Standards and Technology (NIST) in Boulder, Colorado. Leap seconds occur irregularly, which makes it hard for programmers to test their fixes, he explains.
Leap seconds don’t come on a regular schedule because Earth’s rotation varies, says Demetrios Matsakis, chief scientist for time services with the United States Naval Observatory in Washington D.C.
Our planet is slowing down, but it does so in unpredictable ways.
Welcome to my world.
Clocks To Read 11:59:60 as Time Lords Add Leap Second
telegraph.co.uk / 6/29/2015
When the last leap second was added in 2012 Mozilla, Reddit, Foursquare, Yelp, LinkedIn, and StumbleUpon all reported crashes and there were problems with the Linux operating system and programmes written in Java.
In Australia, more than 400 flights were grounded as the Qantas check-in system crashed.
“There are consequences of tinkering with time,” said Peter Whibberley, Senior Research Scientist in the Time and Frequency group at NPL, who is known to colleagues as ‘The Time Lord.’
“Because leap seconds are only introduced sporadically it is difficult to implement them in computers and mistakes can cause systems to fail temporarily.”
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