NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Th. Jefferson: stop wasting time on longitude
From: Frank Reed CT
Date: 2006 May 8, 00:27 -0500
"Why an observatory in the US was needed?
The eclipse times of the satellites were published by European
observatories."
Because of their mutual perturbations, the eclipse times were only
approximately predictable in that era. In the Nautical Almanacs, the explanation notes
that one should use the times there for planning purposed only.
In any case, a whole observatory would not have been required, but other
observers at known longitudes --scattered over as large an area as possible so
that at least one has clear skies for each eclipse.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
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From: Frank Reed CT
Date: 2006 May 8, 00:27 -0500
"Why an observatory in the US was needed?
The eclipse times of the satellites were published by European
observatories."
Because of their mutual perturbations, the eclipse times were only
approximately predictable in that era. In the Nautical Almanacs, the explanation notes
that one should use the times there for planning purposed only.
In any case, a whole observatory would not have been required, but other
observers at known longitudes --scattered over as large an area as possible so
that at least one has clear skies for each eclipse.
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To unsubscribe, send email to NavList-unsubscribe@fer3.com
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