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, optionally, Fortran 77/2003, Python 2/3 and octave/Matlab interfaces 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 2.1 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


Latest stable version

  • Version 3.4.7 (November 2020)
    Sources calceph-3.4.7.tar.gz
    Packages PyPI versionHomebrew versionFedora package
    Octave package calcephoct-3.4.7.tar.gz
    • Fix a decode error of the little-endian SPICE kernel files on the big-endian architectures (e.g. processor s390x).
    • Fix the transmission of the flags FCFLAGS to the fortran compilers.
  • Previous releases



The installation steps for various programming languages are described in the following links.

Other interfaces

The following interfaces for CALCEPH are available:


The library is written by the research team Astronomie et systèmes dynamiques (CNRS/Observatoire de Paris/IMCCE).

For all comments concerning these pages, contact the authors:

Last update Wednesday 11 November 2020