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Re: Sextant accuracy (was : Plumb-line horizon vs. geocentric horizon)
From: Frank Reed CT
Date: 2005 Feb 22, 20:03 EST
From: Frank Reed CT
Date: 2005 Feb 22, 20:03 EST
Alex you wrote:
"Could you explain (or give a reference) how exactly the imaging
resolution
is limited by diffraction and cell density in an "absolute way"?
I don't quite understand this."
is limited by diffraction and cell density in an "absolute way"?
I don't quite understand this."
Imaging resolution is ultimately limited by diffraction in any optical
system. It's a basic property of all wave dynamics. If you google on resolution
and diffraction, you'll find an endless supply of web sites. Here's a
nice page on "visual acuity": http://webvision.med.utah.edu/KallSpatial.html
(this has only a short section on diffraction but it's good reading
nonetheless)
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
