The astropy.wcs.WCS module in Python is a part of the Astropy library that provides functionality related to World Coordinate Systems (WCS) in astronomy. A WCS allows astronomers to convert between pixel coordinates in an image and their corresponding physical world coordinates, such as celestial coordinates. The astropy.wcs.WCS class represents a WCS object, encapsulating all the necessary information and transformations required for these coordinate conversions. It offers methods to perform pixel-to-world and world-to-pixel coordinate transformations, as well as accessing and manipulating the WCS information. It is a powerful tool for working with astronomical images and extracting meaningful information from them.
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