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Lets take the sun for example, how would one know if they were viewing it
with or without refraction to start the analysis?

----- Original Message -----
From: "Lu Abel" 
To: 
Sent: Thursday, January 04, 2007 7:11 PM
Subject: [NavList 1977] Re: refraction


>
> Not much different than measuring bending of the stick, Guy, except with a
> bit of patience required.
>
> If I track the rising or setting of a body, I should see a uniform rate of
> motion in the sky as long as refraction is insignificant.  Once it becomes
> significant, however, the rate should change.
>
> I could, for example, calculate the expected time a body would disappear
> below the horizon based on its motion through the sky.  But I would
> observe it to set later.  The time of observed setting would lead me to a
> value for refraction, ie, the amount the body is below the horizon and
> therefore the amount of refraction.
>
> Measurement of factors such a pressure, humidity, and temperature could
> then be used to refine the parameters.
>
> Lu Abel
>
> Guy Schwartz wrote:
>> Inserting a 4 foot stick half way into a big tank of water at a 45 degree
>> angle, the refraction can be measured or closely approximated.
>> How were the refraction adjustments initially calculated for the
>> atmosphere?
>> What was the methodology used? I don't think it was as easy as the stick
>> in the water method?
>> Thank you.
>> Guy
>> >
>
> >
>
>
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>


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