hebcal software package provides A Perpetual Jewish Calendar, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install hebcal
hebcal is installed in your system.
Make ensure the hebcal package were installed using the commands given below,
$ sudo dpkg-query -l | grep hebcal *
You will get with hebcal package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Utilities |
| Package | hebcal |
| Version | 3.5-2 |
| Description | A Perpetual Jewish Calendar |
| Sub Section | utils |