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They are marks that wipe off easily, nothing permanent.
I just spent some time out with my Astro-Trac and the 35mm lens. From what I've read the astro trac should be fine with the wider lenses if they are pointed roughly south for 2 minute exposures and it was pointed at my solar noon south line I have marked with steel in the ground (pipe laying across the yard dug in for mowing purposes) but my 30 second exposures are still out of focus a little at f2 and more rotation than I would have expected to see so my solar noon south line is not accurate. Possibly not even close.
Of course my intervalometer cable has a broken wire so it no longer works but I managed to find just the short wire that connects to the camera cheap on eBay and purchased 2 of them.. Seeing 49 having sold I'm guessing it's a common problem for that particular device.
I'm out playing after a major migraine all night and no sleep so I'm a little not fussed and the headache hasn't abated or I'd have fitted the polemaster up and aligned everything properly. I do know my tripod head was level this time. Last time some IDIOT (me) decided he'd just level the actual head, not the tripod base where the head screws on, that didn't work out very well.
I'm living proof you don't have to be stupid to do really stupid things. Or I never used to be.........
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