NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigation without Leap Seconds
From: Geoffrey Kolbe
Date: 2008 Apr 22, 13:10 +0100
George Huxtable wrote:
Geoffrey Kolbe responds:
Hello George
As I understand it, the formula adopted by the International Astronomic Union in 1952 and used till around 1985 was:
Delta T = 24.349 + 72.318*t + 29.950*t^2
where t = centuries since 1900.0
However, you are correct that the observed Delta T seems to have been about - 2.7 seconds in 1900. All of which goes to show that time can be a very confusing subject.
Geoffrey Kolbe
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From: Geoffrey Kolbe
Date: 2008 Apr 22, 13:10 +0100
George Huxtable wrote:
However, Geoffrey and I seem to disagree seriously about its earlier value,
around 1900, which he states to be 24.349 seconds. I'm not sure where that
comes from,
Geoffrey Kolbe responds:
Hello George
As I understand it, the formula adopted by the International Astronomic Union in 1952 and used till around 1985 was:
Delta T = 24.349 + 72.318*t + 29.950*t^2
where t = centuries since 1900.0
However, you are correct that the observed Delta T seems to have been about - 2.7 seconds in 1900. All of which goes to show that time can be a very confusing subject.
Geoffrey Kolbe
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
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