P3D Re Moon size

[Larry Berlin <lberlin@xxxxxxxxx>]

> Date: Mon, 17 Jan 00 
> From: Keith Angus <kcr87@xxxxxxxxxxxxxx>
> .........
> The explanation of the 'moon illusion' by the Kaufmans on 
> http://www.research.ibm.com/news/detail/newmoon.html seems reasonable to 
> me, but I suspect Cyclops might not agree.
> 
> keith angus
> 


****  Very funny.

Actually I'm coming to accept that there is an illusion, though their
description still doesn't quite add up. In separate communications it
seems that what IS accepted as an effect visible to the eye, and due to
refraction is a slight flattening of the moon or sun near the horizon.
While this doesn't change it's apparent horizontal diameter, it would
give the outline of that body the appearance of having a larger disc
than is actually there. Later in the sky, when the slight flattening is
gone, the illusion would be gone too. This makes much more sense. Maybe
their illusion is valid to some degree too.
-- 
Larry Berlin

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