Wally wrote:

If one starts from 7nm N of the equator, and goes ESWN, one ends up at the
start point.

Right! I didn't think of that angle...

... Starting on the equator, I get 0.000116nm - 0.215m.

Now that I have my referance library and a spreadsheet instead of a
pocket calculator and faulty memory, I'll try again. It's a more
interesting problem than I thought it'd be....




now I have another question, would the offset be constant as you move
further north or south?


No, it increases. And the change isn't linear.

Yes, I realized this thinking about it on the drive home. So what is it
proportional to, the arcsine?

You and Peter deserve your points. Maybe one day Taddy will write a poem
about you... now there's something to brag about to your grandkids...

Fresh Breezes- Doug King