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Update README.md
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cjhoward committed Nov 4, 2023
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uephem <file> <item> <t0> [<t1> <resolution>]

`file` must be a JPL Planetary and Lunar Ephemerides binary ephemeris file. For an overview of the available ephemerides, see <https://ssd.jpl.nasa.gov/planets/eph_export.html>. Little-endian ephemeris files can be downloaded from <ftp://ssd.jpl.nasa.gov/pub/eph/planets/Linux>. Big-endian ephemeris files can be downloaded from <ftp://ssd.jpl.nasa.gov/pub/eph/planets/SunOS>. μephem is capable of reading both little and big-endian files, regardless of the host endianness. `.bsp` ephemeris files are **not** supported.

`item` is the ID number of an ephemeris item to evaluate. See [the table below](#items) for more details.

`t0` and `t1` are the start and end Julian dates. e.g. `2451545.0` corresponds to the J2000.0 epoch.

`resolution` is the number of time points to evaluate between `t0` and `t1`.
* `file` must be a JPL Planetary and Lunar Ephemerides binary ephemeris file. For an overview of the available ephemerides, see <https://ssd.jpl.nasa.gov/planets/eph_export.html>. Little-endian ephemeris files can be downloaded from <ftp://ssd.jpl.nasa.gov/pub/eph/planets/Linux>. Big-endian ephemeris files can be downloaded from <ftp://ssd.jpl.nasa.gov/pub/eph/planets/SunOS>. μephem is capable of reading both little and big-endian files, regardless of the host endianness. `.bsp` ephemeris files are **not** supported.
* `item` is the ID number of an ephemeris item to evaluate. See [the table below](#items) for more details.
* `t0` and `t1` are the start and end Julian dates. e.g. `2451545.0` corresponds to the J2000.0 epoch.
* `resolution` is the number of time points to evaluate between `t0` and `t1`.

### Items

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