Astronomy: General

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leap second

A Dictionary of Astronomy | 1997 | Copyright

leap second The second that is occasionally added to Coordinated Universal Time (UTC) to keep it within 0.9 s of Universal Time (UT). This is necessary usually once, but sometimes twice, in the year. The leap second is added by extending the final minute of the day by one second either on December31 or June30, although leap seconds can also be added at the end of March and September if necessary.

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second, leap

A Dictionary of Astronomy | 1997 | Copyright

second, leap See leap second.

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"second, leap." A Dictionary of Astronomy. 1997. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

"second, leap." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O80-secondleap.html

"second, leap." A Dictionary of Astronomy. 1997. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-secondleap.html

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Free newspaper and magazine articles

	Leap Day is missing this year from Iran and, oh, so much confusion! Newspaper article from: Iran Times International (Washington, DC); 3/30/2012
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