MIT License

Copyright (c) 2020 Elwood Charles Downey

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

from: https://clearskyinstitute.com/xephem/

      Name                       Last modified      Size  Description
      Parent Directory                                -   
      xephem-4.0.0.tgz.md5       2021-02-08 11:00   58    
      XEphem-3.7-disk2.tgz.md5   2021-02-08 11:03   62    
      XEphem-3.7-disk3.tgz.md5   2021-02-08 11:03   62    
      XEphem-3.7.7-disk1.tgz.md5 2021-02-08 11:02   64    
      XEphem-4.1.0.tar.gz        2021-09-15 10:58   16M  
      xephem-4.0.0.tgz           2021-02-07 21:09   17M  Source code
      XEphem-3.7.7-disk1.tgz     2015-08-13 03:39  476M  Source code, binaries for linux and macOS, lunar images, misc catalogs to mag 15
      XEphem-3.7-disk3.tgz       2016-11-01 03:05  548M  Southern GSC 2.2.0.1 stars to mag 18.5
      XEphem-3.7-disk2.tgz       2016-11-01 03:05  569M  Northen GSC 2.2.0.1 stars to mag 18.5