This tutorial walks you through using the free plate solver service,. I discussed AstroImageJ in my book and discussed plate solving there too.
Other applications like MaxIM DL, Aladin, and many others can take advantage of the information in a plate solved image.
This information can be useful for locating things in your images that might be very small or might be very faint. When you open an image that has been plate solved in software like AstroImageJ, JS9, or JS9-4L, it will display the celestial coordinates of your pointer. The information about the plate solve is written to the FITS header of the plate solved image and is available for use by other applications. Along with the position of the stars in your image, the plate solve also provides details about the location of the center of your image in the sky, the image scale, and orientation. Plate solving your images is a process where you find a match between the stars on your own image and an astronomical catalog.
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