NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Kent Nordström
Date: 2009 Mar 12, 19:59 +0100
Herbert Prinz wrote [7634]:
accuracy of a given algorithm in a specific implementation (such as,
say, a work sheet for Dunthorne's formula, broken down into such and
such terms, evaluated by, say, 5 place logarithmic tables).
Thanks for providing the pages from
Astronomische Nactrichten. There might be one kind of explaination there. When
you take a look at the Fehlergrenze for Dunthornes formula you find that
these Fehlergrenze seem to be lowest for distances between say 60 and 100
degrees independant of the parameter d (difference between altitudes). Also it
seems that the Fehelrgrenze is rather constant between these two values. It
might be a matter of choice to conclude that the Fehelrgrenze is lowest
between 70 and 110 degrees and then state the limitation in the Lehrbuch. I
certainly know that this explaination is far from scientific and ask you to
comment whether you find my conclusion realistic?
Anyway I have found the pages of interest
because my own lunar distance programming is done with Bremikers method
including use of logs (which is of course not necessary but was a way to
compare results from old manuals with examples using
logs).
I have also taken a quick glance on the
Encyklopadie der Physik but as Herbert has pointed out there are no
discussions about accuracy to be found.
So for the time being this leaves me with a
couple of possible explainations from Frank and George together with my
own.
Kent
N
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