Neil deGrasse Tyson

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Sun Jun 28 21:13:58 +0000 2015

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Neil deGrasse Tyson @neiltyson

June 30th's leap second will manifest as an extra second in the last minute of the day, Greenwich time. ( 7h 59m 60s PM ET) — PolitiTweet.org

Posted June 28, 2015

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Neil deGrasse Tyson @neiltyson

The Moon continually tugs on Earth’s rotation, slowing us down bit by bit. To compensate, Tuesday, June 30 gets a leap second — PolitiTweet.org

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Neil deGrasse Tyson @neiltyson

Since 1972, after we discovered we keep better time than Earth does, we’ve added 25 leap secs. Done only on June 30 & Dec 31. — PolitiTweet.org