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On 1/14/06 9:24 PM, "Fred Hebard"  wrote:

>
>
> Great post Ken.  I can imagine it would be a lot of fun, or
> something, to try to work out a sight by hand while steering with
> one's knees!
>
> How would you measure squash?  The altitude of the two limbs and
> assuming the SD for the width or the semi-diameter both ways?  I
> don't know how to do semi-diameter with an aircraft sextant (or
> anything else with an aircraft sextant!).
>
> Fred
>
Thanks Fred,

The idea is just a visual observation without a sextant.  The ellipse
templates as mentioned, could be used to compare with the squashed sun to
get a good value.  The entire squash phenomenon takes place during a 15 to
20 minute period.  The first discernable squash is at about 2%, and can best
be seen with the head tilted 90 deg to the side. For some reason we humans
can detect a slight ellipse with the major axis vertical rather than
horizontal.

Ken

   

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