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Put JPL digital ephemeris files (DE200, DE405, or DE406) here to use
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for computing planetary positions. Xplanet uses Bill Gray's code
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(http://www.projectpluto.com/jpl_eph.htm), which reads both big and
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little endian binary files. The ephemeris files found at
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ftp://ssd.jpl.nasa.gov/pub/eph/export/unix are big endian files, but
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you do not need to do any additional byte-swapping to use them.