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I think you are saying you wish to know what it is ?.
If so,.. then ...
Its basically the bending of either the support holding the guider scope mounted on the main telescope, or the focuser bending slightly due to the fact the camera is weighing it down (Droop). But this has more effect when the focuser is at low angles (Like near the horizon), as this is when you get the most flexing of the focuser. The flexing of the support can be at many angles, due to the way it is supported.
Theo
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