Astrometry.net 2MASS index files downloader (16'-22')

 The astrometry engine will take any image and return the astrometry
 world coordinate system (WCS), a standards-based description of the
 transformation between image coordinates and sky coordinates.
 .
 This package downloads the 4206 index files from the 2MASS survey
 containing skymarks of sizes 16 arcminutes to 22 arcminutes from
 data.astrometry.net. The installation requires a working internet
 connection.