Well assuming a spherical Earth
'India-Mike
Is an isogonal a great circle?
pilotezulu
Isogonals are just lines of equal variation.
I guess I could say that they are not necessarily the same
Perhaps not, but has anyone got a definitive answer? Things seem to have gone off topic after 2nd post, interesting as it may be.
If isogonals are indeed not great circles, is the agonic line a special case? I've not seen this marked on a worldwide map before. I'm drawing a comparison with parallels of lattitude, all small circles except the one that's neither North nor South. I'm assuming a spherical Earth of course.
Cheers
PS - 'India-Mike, you'll need to change your name
