Representing Celestial Coordinate Systems - 1

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  • The image of the Crab nebula (left) was constructed by overlaying separate radio, optical, and X-ray images.


  • Clearly the whole is greater than the sum of its parts.


  • Although no coordinate graticule is shown, the underlying geometry of the three images must have been made conformant (by regridding) in order for the images to register properly.


  • This image graphically illustrates the requirement for accurate coordinate information in multi- wavelength astronomy.