$ sudo apt-get update
$ sudo apt-get install gdl-astrolib 

gdl-astrolib is installed in your system.

Make ensure the gdl-astrolib package were installed using the commands given below,

$ sudo dpkg-query -l | grep gdl-astrolib *

You will get with gdl-astrolib package name, version, architecture and description in a table

gdl-astrolib package basic information: