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Subject: Re: Digital Sextant
From: Craig (c.scott@XXX.XXX)
Date: Tue Apr 02 2002 - 21:09:50 EST
Keep in mind that some of these units operate above a lot of the atmosphere
and weather. The star Sol is usually visible in daylight!
-----Original Message-----
From: Navigation Mailing List [mailto:NAVIGATION-L@XXX.XXX]On
Behalf Of Brian Whatcott
Sent: Tuesday, April 02, 2002 21:04
To: NAVIGATION-L@XXX.XXX
Subject: Re: [NAV-L] Digital Sextant
At 11:35 AM 4/2/02, you wrote:
>Paul Hirose wrote:
>'This system absolutely would track stars in broad daylight, even under
>a hazy sky.' also 'and this was in bright sunlight.'
>
>How did it manage to do this?
I'll try for a response to this:
There was an urban myth, popular in the years 1990-1994, that
the ability to see stars in daylight from the foot of a well was an
urban myth. It turns out, that if you know exactly where to look in
daylight, and have reasonable acuity you can see Venus by day, if the
atmosphere is not too
milky with moisture. Venus is the brightest point object.
There are a few other brightish objects, which have more difficulty
competing
with daylight scatter. It is possible however, with a little sleight of
hand, to sense signals which are submerging, even well down, in the 'noise'.
It will be this method that allows a fix on day light stellar objects.
Brian Whatcott
Altus OK Eureka!
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