/usr/share/xplanet/ephemeris/README is in xplanet 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Put JPL digital ephemeris files (DE200, DE405, or DE406) here to use
for computing planetary positions. Xplanet uses Bill Gray's code
(http://www.projectpluto.com/jpl_eph.htm), which reads both big and
little endian binary files. The ephemeris files found at
ftp://ssd.jpl.nasa.gov/pub/eph/export/unix are big endian files, but
you do not need to do any additional byte-swapping to use them.
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