Did you wake this morning feeling especially rested? Or did you toss and turn all night wondering why the night was taking so long?
Either way, you were right. Last night we had an extra-long night (30 June 2012), thanks to a leap second.
Yes, our official time (courtesy of the atomic clock which measures time via atomic vibrations) gets slightly out of synch with “real” (solar) time, by which I mean the natural time set by the rotation of the earth around the sun. Again, the moon is at fault; the tidal surges, waxes and wanes are causing a slight slowing and wobbling of the earth’s rotation. Hadn’t you noticed the wobbles?
We could adjust the length of the unit we call a second to account for this, a minuscule lengthening. But then counting “one-hippopotamus, two-hippopotamus” etc might not work so well. And it’s not even regular about how often the atomic clock needs adjusting. It has been adjusted 25 times since such accurate time measurement began in 1972. The first year saw two leap seconds (June 30 and December 30), followed by seven years of one second per year. The last three adjustments were 1998, 2005 and 2008.
So instead we wait until a whole second has accumulated and add a leap second, just as we add a leap year, thereby adjusting our inflexible human system of measuring time to the mutable system that exists in nature.
And so we got an extra second last night, to sleep, toss and turn, or party, whatever you happened to be doing at 11:59:60 last night, which fell between 11:59:59 and 12:00:00 (midnight at the International Dateline).
Hope you enjoyed it! And if you wasted it, don’t worry another one is sure to come along sooner or later!
UPDATE: Latebreaking news! While the Y2K bug turned out to be a fizzer, the leap-second has actually had consequences! For those who are too young to remember the Y2K bug, this was the predicted beginning of the apocalypse caused because computer programmes in the 1980s and 1990s apparently didn’t have the forethought to realise that eventually in the not too distant future, computers with a clock in their functioning would need to click over from 19XX to 20XX. People (who would now be called preppers) stocked up on water supplies and canned goods and built underground bunkers. Planes were going to drop out of the sky. Nothing happened. Complete fizzer.
The leap second on the other hand has managed to bring down the airport check-in system at Australian airports, resulting in airline staff having to check in passengers and luggage by hand, delayed flights and lots of irritable grumpy passengers. Also reportedly brought down, Reddit, Gawker, LinkedIn, Yelp and Foursquare. And according to news reports, this is because the computer couldn’t cope with the leap second (which was 9:59:60 in Australia EST).
Have you heard of any other effects?