Neil deGrasse Tyson

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Last Checked May 18, 2019

Created

Sat Jun 30 13:04:04 +0000 2012

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Neil deGrasse Tyson @neiltyson

How are Leap Seconds added? At the Prime Meridian, 12:00:00 normally follows 11:59:59pm but will instead follow 11:59:60pm — PolitiTweet.org

Posted June 30, 2012 Hibernated

Preceded By

Neil deGrasse Tyson @neiltyson

We could, in principle, re-define the length of the second each time. Instead, we wait until one accumulates and add it whole — PolitiTweet.org

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Neil deGrasse Tyson @neiltyson

.@fractal74 Pure GPS time, from 1980 onward, adds none of the 15 LeapSeconds since then. After today they'll be 16 secs ahead — PolitiTweet.org