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You could do this offline of gemini-ii though I think? If you have the mount at CWD, you can rotate the setting circles on the mount so that the RA axis is at 12 hours and the declination is at 90deg. Then you loosen the clutches and point the scope to various places marking the RA and Dec from the setting circles as you map your horizon/trees. The difference in the RA setting circles at a given Declination for one of the holes you are interested in, is also how long in hours the object would be visible in that hole. Unless I'm not understanding right. If you want the Az/el data from that then there is a calculation you must do.