A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Herman Dekker
Date: 2022 Nov 24, 01:45 -0800
I readed yesterday one old post about the tilde ~
The meaning of the tilde operation was
"Subtract the smaller from the larger if of the same name and add if of different names".
Today, you can assume algebraic signs are well-known and treat dec and lat as positive if north and negative if south.
Then calculate the difference always and take the absolute value (meaning, if the result is negative, you drop the sign).
Can you replace the word different with the word contrary?
"Subtract the smaller from the larger if of the same name and add if of contrary names".
I ask this because the word contrary is more often used in celestial navigaton calculations and more understable for me.
(I am born with Dutch language so english is not always clear for me)