astrometric solution for the image

[crawfordsm]

Calculate the astrometric solution for the images by comparing objects in the field to sources of known position

[juliotux]

Try Astrometry.net.

I've wrote a little wrapper to do this calibration with that program in my own reducing facility. I will upload it in github and post here.

[crawfordsm]

That would be great @juliotux -- thanks for offering to help.

[crawfordsm]

This could be taken care/integrating in with this pull request to astroquery:
astropy/astroquery#521