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Slickcraft · 01-27-2019, 02:15 PM

I saw the sign;

"Flat Earth Lake Test", 3pm, 2 Feb, Alton town docks. There is a lot on the net such as:
https://www.youtube.com/watch?v=0hv127-2vI8

IMHO it is very difficult to accuracy conduct such a test such as taking into consideration atmospheric refection at that instant in time and just above the ice/snow surface. On winter days there is normally a temperature inversion just above the ice surface which can result in refracting the laser light to follow the curvature of the several mile ice surface.

01-27-2019, 02:15 PM	#5
Slickcraft Senior Member Join Date: Mar 2008 Location: Welch Island and West Alton Posts: 3,217 Thanks: 1,173 Thanked 2,001 Times in 915 Posts	I saw the sign; "Flat Earth Lake Test", 3pm, 2 Feb, Alton town docks. There is a lot on the net such as: https://www.youtube.com/watch?v=0hv127-2vI8 IMHO it is very difficult to accuracy conduct such a test such as taking into consideration atmospheric refection at that instant in time and just above the ice/snow surface. On winter days there is normally a temperature inversion just above the ice surface which can result in refracting the laser light to follow the curvature of the several mile ice surface. Last edited by Slickcraft; 01-27-2019 at 02:56 PM. Reason: mention temp inversion