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Most people who take the same object over several nights will be using plate solving software when capturing. This basically references the following night's framing with the initial first night framing. You can do it manually but it can be tricky and time consuming. In so far as individual sub exposures in a single session, there may be a slight drift between them but the stacking software will register to the star positions not the framing. The result may require cropping the image to eliminate the overlapping framing around the edges of your image, depending on the amount of drift during exposures.
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