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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: FW: A noon sight conundrum
From: Herbert Prinz
Date: 2003 Nov 24, 04:58 -0500
From: Herbert Prinz
Date: 2003 Nov 24, 04:58 -0500
Kieran Kelly wrote: > While the sun's altitude does not change at culmination its > progress across the sky certainly does. I do not believe it is stationary > for 18s. Why not? Without taking the altitude of the sun into consideration, we can estimate the lower limit of the rate of change of azimuth at noon (that's when it changes the fastest) as 15deg/hour = 0.1deg/0.4min. The above value is well within this limit. More specifically, for the given altitude, multiplying 0.4min with cos(47.5) obtains 16s. Herbert Prinz
