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


Latest stable version

  • Version 2.3.2 (January 2017)
    • Fix the return value of the function calceph_getconstant if the constant name "AU" or "EMRAT" is not available.
    • Fix the documentation for the fortran interface of the function calceph_prefetch.
    • Fix the return value of the function calceph_orient_unit if the frame SPICE kernel file is missing.
  • Previous releases


Version 2.3.2 html pdf


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 (CNRS - Observatoire de Paris - IMCCE).
For all comments concerning these pages, contact the authors :

Last update Tuesday 08 August 2017