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Re: A noon sight conundrum
From: Bill Arden
Date: 2003 Nov 24, 12:01 EST
From: Bill Arden
Date: 2003 Nov 24, 12:01 EST
Gee, why do we bother trying to take time measurements to the second when we're taking sights? <g>
Bill Arden
In a message dated 11/24/2003 9:18:07 AM Central Standard Time, hprinz@ATTGLOBAL.NET writes:
Peter Fogg wrote:
> As best I understand it, he is saying that the
> rate of change is smaller than the units we are using - ie, one tenth of a
> minute of arc? Any chance of more detail about this?
Yes, Peter, you understood the principle correctly. Except that the unit (=
resolution of the azimuth table) is 0.1deg, not 0.1' as you say. The sun needs
24s to move 0.1deg in LHA. The change in azimuth in the course of a whole day is
on average the same. But it will usually be faster at noon and can be
considerably slower (even zero) at other times.
Herbert Prinz