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Subject: Re: Calculating accurate apparent-angles between stars
From: Fred Hebard (Fred@XXX.XXX)
Date: Mon Jan 06 2003 - 22:36:32 EST
George,
My understanding is that the method you presented at the head of this
thread computes an expected observed interstellar distance given a
known position and time. This is somewhat the inverse of computing a
time from an observed interstellar distance. My understanding is
that Borda's, Young's and Bruce Stark's methods address the latter
question. In referring to those procedures, I was merely expanding
upon your statement that "Unfortunately, doing the reverse
calculation, to discover the time and the longitude from a lunar
distance, is somewhat more difficult," and implying that they are not
appropriate to the "apparent-angle between stars" problem.
I must reiterate that I am a complete neophyte in these matters and
must perforce bow to your thorough knowledge and experience. I was
merely comparing the numerical result from Young's method to that of
Stark, and the inputs. I was assuming since both methods addressed
the problem of clearing an observed lunar distance of the effects of
refraction, parallax, semidiameter, augmentation, etc, they would be
methods for solving similar spherical triangles. I know not whether
this assumption is correct. The purpose of the comparison was to
extend my understanding of the procedures.
Fred
-- -------------------------------------------------------------------------- Frederick V. Hebard, PhD Email: mailto:Fred@XXX.XXX Staff Pathologist, Meadowview Research Farms Web: http://www.acf.org American Chestnut Foundation Phone: (276) 944-4631 14005 Glenbrook Ave. Fax: (276) 944-0934 Meadowview, VA 24361
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