NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: What do "d" and "v" really stand for?
From: Jeremy C
Date: 2008 Jun 21, 08:53 EDT
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From: Jeremy C
Date: 2008 Jun 21, 08:53 EDT
In a message dated 6/20/2008 9:54:39 A.M. West Pacific Standard Time,
jn.wilson@juno.com writes:
Greg:Sorry. That makes for a more interesting question, to which I don't know the answer. My Navigation instruction referred to v as the velocity correction, but I don't know why.Jim Wilson
Jeremy replies:
I don't know the exact answer to Greg's question, but "velocity" isn't too
far off as a good descriptor. After all, it just adjusts the speed of the
body from the standard change in GHA given in the daily pages as well as
increments and corrections pages. We see them in effect for the planets to
adapt the sun GHA speed, and then the moon for her fluctuating change in GHA
over time. I don't teach Celnav, but it might help people remember.
It has been too long since I took Nav 1 in college (where they taught me all of
this stuff) to remember how the instructor presented it.
Since I am now home and have access to my Library, my 1981 Bowditch Vol II
defines "v" as "excess of GHA change from adopted value for 1 hour" (pg
953). On page 951, it defines "d" as declination change in 1 hour."
Jeremy
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