NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Leap second today
From: Lu Abel
Date: 2012 Jun 30, 11:13 -0700
From: Lu Abel
Date: 2012 Jun 30, 11:13 -0700
Or folks can go to www.time.gov to watch the clock. I've done it for a past leap second and the NIST clock does indeed show the sequence (especially the 7:59:60) Frank describes.
I suspect my atomic clock that synchronizes to WWVB will not show the sequence, but simply reset itself, but Frank has be curious. 5PM for us West Coasters.
From: Frank Reed <FrankReed@HistoricalAtlas.com>
To: NavList@fer3.com
Sent: Saturday, June 30, 2012 10:13 AM
Subject: [NavList] Leap second today
A leap second will be inserted into the calendar today just before midnight UT. That's 8pm Eastern Daylight Time. A properly programmed clock this evening in the eastern US should read the following sequence of times:
7:59:58
7:59:59
7:59:60
8:00:00
8:00:01Leap seconds have been added on December 31 three times in the past fifteen years. This is the first leap second added in June since 1997 and given the pace of technological change in that period, it will be an interesting test case for the theory that some computer systems cannot handle leap seconds properly.So here's a navigational question for you to ponder: how much should the GHA of objects listed in the Nautical Almanac be adjusted after midnight UT tonight? Is your Nautical Almanac now "wrong"? Or is it always "right"?-FER----------------------------------------------------------------
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