I don't have an answer Rich, however some (somewhat) possibly related discussion in some old threads.
https://www.winnipesaukee.com/forums...ight=curvature
https://www.winnipesaukee.com/forums...st+view&page=2
Seems it's a popular theory to test when there is ice on a body off water over a long distance.
I'm curious too what people might know about this.
In your post it does not say if the test is trying to prove flatness or roundness.
Quote:
Originally Posted by Rich
Are any space aliens involved?
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I hope so. Every winter when us summer boating people start going nuts we need something to read / talk about.