Losmandy G8 mount on loan to astronomy club equipped with a Nexus II/w encoders. The instrument has been out of use for a time (pandemic), and we are trying to get it working again with Sky Safari Pro on an iPad.
last night, connect scope, realign on Arcturus, swing to Vega, the cursor lands fairly nearby. Center the star in the scope, highlight it on the screen then hit align. The cursor goes to the star as it should. But try another object and the cursor goes the wrong way. Swing the scope, and the cursor is backward in Dec. Disconnect, go to settings and change the sign on the Dec axis (RA was positive 311296, Dec negative) go back, connect the scope, and it is still backwards??? We switched the sign back and forth several times, no change.
So, perhaps we need to start a new alignment after swapping the sign, to clear things out. We do that, and after re-align on Arcturus, everything is moving in the right direction. Swing to Deneb, and the cursor, as with Vega before, moves near the target star. Highlight the star, center it in the scope, hit align the cursor pops on the star. Move the scope, and the cursor still moves in the right direction. But, attempt another object, and Dec is again going backward and the cursor is well off a fairly nearby object in Dec.?
Driving home, I started to wonder if SkySafari’s location setting, clock or something like that is incorrect. Not where I can check it now, but the sky displayed in the “now” setting, was certainly not alien to the time date, and location.
We spent several hours screwing with this. Flipping the scope around one side of the pier and then the other. Removing the scope and turning the Dec around, an reinstalling the scope. Nothing works.
It seems odd that the cursor goes generally near the second-alignment star, but the separation between the stars in both cases is far greater in RA than Dec, so that explains that I suppose. The key puzzling feature is swinging the scope sends the cursor in the correct direction until you have aligned with the second star and try to go somewhere else.
Hope to go back up tomorrow night. Hoping someone knows what the issue is, or has an idea.