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Coverage Status Version on PyPI Discord

About the project

Kosmorro is a software that allows you to compute the ephemeris for a date, a month or a year.



Kosmorro requires the following software to work:

  • Python ≥ 3.5.0
  • PIP

Production environment

Keep in mind that Kosmorro is still in alpha development stage and is not considered as stable.


Arch Linux, Manjaro…

Kosmorro is available in the AUR.

Other distributions

Kosmorro is available on PyPI, a repository dedicated to Python. First, install python-pip on your system and invoke the following command: pip install kosmorro.


Currently, macOS does not provide Python 3, so you will first have to install it. If you don't have it, first install HomeBrew, then install Python 3: brew install python.

This will install Python 3 and its PIP on your system. Note that their executables are called python3 and pip3. Now, you can install Kosmorro with your PIP: pip3 install kosmorro.


Kosmorro being at an early-stage development, Windows is not supported officially for now.

Development environment

First, install Pipenv.

Clone this repository and run pipenv sync to install all the dependencies. Then, run Kosmorro by invoking pipenv run python kosmorro.

For comfort, you may want to invoke pipenv shell first and then just python kosmoro.

Using Kosmorro

Using Kosmorro is as simple as invoking kosmorro in your terminal!

By default, it will give you the current Moon phase and, if any, the events that will occur today. To get the rise, culmination and set of the objects of the Solar system, you will need to give it your position on Earth: get your current coordinates (with OpenStreetMap for instance), and give them to Kosmorro by invoking it with the following parameters: --latitude=X --longitude=Y (replace X by the latitude and Y by the longitude).

Kosmorro has a lot of available options. To get a list of them, run kosmorro --help, or read its manual with man kosmorro.

Note: the first time it runs, Kosmorro will download some important files needed to make the computations. They are stored in a cache folder named .kosmorro-cache located in your home directory (/home/<username> on Linux, /Users/<username> on macOS).

Exporting to PDF

Kosmorro can export the computation results to PDF files, but this feature requires first that you install some additional dependencies. Before you use this feature, please check these packages are installed:

  • A LaTeX distribution:
    • Linux: install TeXLive through your packages manager. Kosmorro just needs the minimal installation, you don't need any extension.
    • macOS: install MacTeX, the basic version will suffice:
      • from the official website, choose the smaller download
      • with Brew: brew install basictex
  • The latex Python library:
    • Arch Linux: the library is available on the AUR
    • Any other systems: install it through PyPI: pip install latex

These dependencies are not installed by default, because they take a lot of place and are not necessary if you are not interested in generating PDF files. The first time you ask Kosmorro to create a PDF, it may be a little verbose. You can ignore its blahblah.

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