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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: The taxonomy of refraction
From: John Huth
Date: 2011 Jan 7, 09:41 -0500
From: John Huth
Date: 2011 Jan 7, 09:41 -0500
Marcel -
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Keeping up with the grind
I guess my first-order thinking is that the apparent horizon is going further out as the day progresses, and I can go back and test this against the theory, given the conditions. But, the inferior image gave me pause. I'll send them on to your expert as you suggest.
Best,
John H.
On Fri, Jan 7, 2011 at 9:32 AM, Marcel Tschudin <marcel.e.tschudin@gmail.com> wrote:
Uuups, I mixed up the temperatures John provided. If the water is
colder than the air (and not the other way round) then it's unlikely
to be an inferior mirage. I have therefore the same question as John
has when he mentions "Nominally I associate this with the "hot road
mirage", where the surface of a road is hotter than the air above it".
The "hot road mirage" is actually the inferior mirage. I'm therefore
also interested what Andy comments on it. Please let me know. I must
admit that I'm not really familiar with these optical effects on
distant landscapes since I observe the effects on the setting sun.
It's the shape of the setting sun which informs me on larger
temperature differences between sea and air and shows which is
(considerably) warmer or colder.
Marcel
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Keeping up with the grind
