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TheSky6 starts with the GSC and proceeds to more dense catalogs as needed. In the recommended default setup, GSC, Tycho and UCAC are used.
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Problems with plate solving are generally not related to telescope coordinates. Generally the coordinates must be within one or two FOV's and is easy to do.
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Telescope coordinates: CCDAutoPilot gets this information from the mount via the chosen telescope control program.In order to be successful, three things are required: telescope coordinates, known image scale and sufficient catalog stars in the image. Successful plate solving is essential for automated imaging. Knowing approximately where the telescope is pointing and the system image scale, plate solving algorithms can calculate the center of the image to sub-arc-second accuracy. Plate solving is a technique that measures precisely where the telescope is pointing by taking a CCD image and then using various pattern matching techniques, matches the stars in the image to a given star catalog.
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