The International Earth Rotation Service is calling for a leap second - the 24th of its kind since the first in 1971. I wonder what they did before that?
At midnight GMT (Greenwich Mean Time) on December 31st, the world will stop while a second is added to clocks everywhere.
The Earth rotates at different speeds in different years. The moon’s gravity supposedly has something to do with this. IERS uses calculations from more than 200 atomic clocks which base their time measurements on atomic resonance frequency.
Timekeepers warn that refusing to coordinate clocks might lead to lapse or collapse in communication, aerospace, finance and transportation. Remember Y2K!
Atomic time was introduced in 1958. Since then the Earth’s rotation has gained 33 seconds. I wonder, how did we and the animals get along before we had atomic time to tell us we were all off?
When I was in the Navy, we learned that the most reliable, predicatable and accurate measurements for navigation and time were the stars. Seems like we can’t be the Creator’s doing no matter how hard we try.
What are you going to do with your extra second?
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2 Responses to “International Earth Rotation Service Calls for a Leap Second”
Before leap seconds the length of the second was adjusted ad hoc, and lots of smaller steps were used to reset the clocks to agree with the stars.
See the web page in the link, and the ones referenced therein.
Historically local time was set by the rising sun. Two hundred years ago time varied greatly throughout the country. It was the railways that required co-ordination. In 1850 London was the centre of world watchmaking due to the British Navy. Even the foundations of Rolex began in London. Captains required accurate timepieces to navigate. They could fix their position up and down on the chart by the stars. Time was needed to find out how far around the globe they were. Accurate time pieces allowed captains to sail diagonally across the chart before that they simply went up and down the chart by the stars and then turned left or right at the appropriate latitude.
The International Space Station, permanently manned by a crew of 3, orbits the Earth every 91 minutes so things have moved on quite a bit since railways.
Time however is a variable, the speed of light is the only constant.
Einstein concludes we all have our own personal time as time slows down the faster we go. That goes for the stars too, which are all accelerating away from each other at an increasing rate.
Still no excuse for being late.
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