I was thinking of something similar to the screen which is shown for Polar alignment assistant. But thinking through this process and Jasem's suggestion,....As a lot of folk dont have automated rotators, I think the way it could work is the sky map is used for defining the area of capture and creating the sequence. Once the capture is initiated it would allow the user to rotate the camera to get right ROI. At this point, I think it would be good to be able to see what camera is capturing as well as sky map, as some of the objects will be so faint that you wouldnt see in camera if you have right orientation. Once user is happy with orientation, the capture sequence is initiated.
Thoughts?

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