SourRescuer Finding the sun and moon directly are both harder than DSOs because it can't do plate solving, so it relies very strongly on both compass and level calibration. It does a search, by angling up to the predicted angle of the sun or moon (which is why it needs level calibration), then it starts about 30 degrees off angle (because compass is never that precise it can't just point directly at it, so it points to the side of it), and then sweeps across maintaining the altitude angle until it sees some sliver of sun or moon in frame, and then moves to lock in on it. Without everything being calibrated it can miss pretty easily. Another issue is that sometimes there's some internal lens reflections that cause it to think it sees the sun or moon, and it starts chasing that.
For the sun, I just 3d printed a solar tracker. You place it flat on top of the moving part of he scope, aligned with the side of the base, and manually drive the scope until the little dot of sun shining through a pinhole lines up with a target. Takes seconds to get there. For moon, I'm usually shooting it at night, so I'll let it find a DSO object first, then switch to the moon once it knows exactly how to get there. For daytime/sunset moon.. have to get the calibrations done perfectly.
