A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2018 Mar 13, 09:37 -0700
Robin, you recommended
Have a look at https://www.youtube.com/watch?v=eLR3zKxpcso or google "parabola for multiplying numbers",
Thanks a lot! I just realised I must go again to the elementary school!
Now I'm puzzled even more - I need to clearly understand the piece about the slopes of the lines there... Working on it.