Thanks. But why is [the North Pole} displayed South in your link? it's displayed bottom while with all my scopes I find it top on Mars? The scope swaps W and E but not N with S.
An easy way to determine North and South in the eyepiece is to simply nudge your scope toward or away from Polaris. Even works with a driven scope that is tracking. If you nudge toward Polaris, the side of your field that gains more sky is the North. If you nudge away from Polaris, the side of your field that gains more sky is the South.
Handy with everything from Martian polar caps to Jupiter's equatorial belts to Saturn's tilt orientation and more.