IMCCE CNRS Observatoire Observatoire de la Côte d'Azur
CALCEPH library

This library is designed to access the binary planetary ephemeris files, such INPOPxx, JPL DExxx and SPICE ephemeris files.
This library provides a C Application Programming Interface (API) and, optionnally, a Fortran 77/2003 and Python 2/3 interface to be called by the application.


This software is an open-source product distributed under three distinct licenses giving you the choice of one of the three following sets of free software/open source licensing terms. This allows the use of our code in as wide a variety of software projects as possible.

This software is governed by the CECILL-C, CECILL-B or CECILL version 2 license under French law and abiding by the rules of distribution of free software. You can use, modify and/or redistribute the software under the terms of the CeCILL-C, CeCILL-B or CeCILL license as circulated by CEA, CNRS and INRIA at the following URL




The installation steps for various operating system are described in the following links


The library is written by the research team Astronomie et Systèmes Dynamiques (IMCCE, CNRS, Observatoire de Paris, PSL Research University).
For all comments concerning these pages, contact the authors :

Previous release downloads

Last revision : 12 September 2016

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