A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Brad Morris
Date: 2018 Feb 11, 18:54 -0500
I'm reading the "History of Nautical Astronomy", Mr Cotter describes the state of (apparently insufficient) mathematical literacy of seamen of 15th century like that:
...importance in introducing to the English seamen ... the elements of mathematics beyond the golden rule of three.
What is that?
Recently I had some hard time guessing what the "butterfly multiplication method" is. We, in Russia, were never tought anything like that.