Got it - so once the sun is initially centered in the frame, adjust the alt/az knobs of the wedge and don't touch the geared head. But do you know which adjustments to make? If the sun is drifting down in the frame, what should i adjust? if it's drifting up in the frame, what should i adjust? etc. etc.
There's the rub...
If the object you're using to drift align on (the sun, in this case) is due east and close to the horizon, it will drift to the north if the polar axis elevation angle is too high, to the south if PA angle is too low (I think... I'm visualizing this in my head). Reverse for objects low to the west. It will not (well, hardly at all) be sensitive to PA error in azimuth.
If the object is close to the meridian, it will drift to the south if the PA azimuth is too far east, and to the north if too far west (again, I think). Here, PA elevation error has no (or little) effect.
Midway between these points, the drift direction will be a mix of these direction errors.
Which direction is up? This depends entirely on the orientation of the camera in the OTA. Easiest to work with is to rotate the camera so that the top of the frame is north (or crosshairs aligned N-S-E-W if you're trying this visually, but beware of complications - flipped image and rotation - if you're using a diagonal).
The main problem trying to do this with the sun on the morning of the eclipse is that getting the elevation angle close to correct by measuring its angle is already easy compared to setting the azimuth correctly, and you have to wait until near midday before you can use this method where it's most sensitive to azimuth error.
Edited by SkipW, 31 January 2024 - 01:11 PM.