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'Ephemeris' reads, writes, and interpolates the JPL planetary ephemeris data that is the world standard planetary dataset. It should compile on any machine that uses gcc and supports IEEE floating point arithmetic, and has been tested under GNU/Linux. It uses an included library, gnulliver.c, that automatically handles integer and floating point Big-endian/Little-endian byte swapping to match Big-endian/network order on any computer. gnulliver.c can be used separately under the LGPL 2.1. This is a redesign of JPL's original FORTRAN code, available on JPL's FTP website (, with some added flexibility (including patching some inconsistencies in the original JPL data files). 'Ephemeris' is not associated with JPL or NASA, but just uses JPL's data.


User README included and available from


Download version 1.0 (beta)
released on 22 May 2004


Related Projects


LicenseVerified byVerified onNotes
LGPLv2.1Janet Casey24 May 2004

Leaders and contributors

Paul Hardy Maintainer

Resources and communication

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Bug Tracking VCS Repository Webview
Bug Tracking,Developer,Support E-mail
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Software prerequisites

Kind Description
Required to build make

This entry (in part or in whole) was last reviewed on 7 January 2008.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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