I had forgotten that fact, thanks. But it does make sense that he would in order to find a true center. I suspect he considered it the c.g. point, right?

__________________
Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.