NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sun sights during an eclipse: "bad limb" calculation
From: David Pike
Date: 2023 Oct 17, 09:55 -0700
From: David Pike
Date: 2023 Oct 17, 09:55 -0700
Kermit you wrote: If you add 3 feet to the cord, it will evenly “fly” just under a foot from the surface,
Kermit
At my school that would be:
c2-c1=36”
c2=2pi r2, so r2=c2/2pi
c1=2pi r1, so r1=c1/2pi
Therefore: r2-r1= 1/2pi(r2-r1) = 36”/2pi = just less than 6” from the surface.
For the second part, the apex height must be a fn of r, because as r shrinks to zero the height would gradually increase to 18”. Oh dear, there goes my 40 minutes before tea. DaveP
