# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Watches as chronometers
From: Gary LaPook
Date: 2013 May 31, 14:50 -0700
 Oops! I am so embarrassed because  I did not allow for the one leap second inserted during the test period on June 30, 2012. I can account for it now by either subtracting one second from the measured error or by adding one second to the calculated error and I will do it the second way. Trying one more time.Should be:```A = 306/267/+39 fast: B = 528/537/ -9 slow: C = 886/907/-21 slowAveraging these differences equals 3 seconds fast.Using only one watch with the largest error, 39 seconds, would resulted in less than a 10 minute of longitude error. Using the average of all three watches would have produced an error of only 3/4 of one minute of longitude,a maximum of 4,557 feet, 1,389 meters at the equator.Sorry.glgl```--- On Fri, 5/31/13, Bill B wrote:From: Bill B Subject: [NavList] Re: Watches as chronometersTo: garylapook@pacbell.netDate: Friday, May 31, 2013, 11:42 AM```On 5/31/2013 1:11 AM, Gary LaPook wrote: > Using only one watch with the largest error, 40 seconds, would > resulted in a 10 minute of longitude error. Using the average of > all three watches would have produced an error of only one minute > of longitude, not bad for fifty-one dollars worth of watches > after more than three and a half years. Being it is you I am almost embarrassed to ask, but did you factor leap seconds into your computations? Bill B ``` View and reply to this message: http://fer3.com/arc/m2.aspx?i=124231
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