Retrieve, represent and manipulate JPL Horizons ephemerides.
Project description
Readme
The eph package provides some useful functions, classes and tools to retrieve, parse and manipulate ephemerides in an astropy-compatible way.
Basic Usage
import eph
req = eph.JplReq() # create the request
req.read('.ephrc', 'jplparams') # read parameters from 'jplparams' section in '.ephrc' file
req.set({
'COMMAND': 'earth',
'START_TIME': '2007-11-17',
'STOP_TIME': '2017-4-22'
}) # set parameters from dictionary
res = req.query() # perform the request obtaining a response from Jpl Horizons service
ephemeris = res.parse() # extract and parse the ephemeris contained in the http response
print(ephemeris) # print dataThe content of .ephrc can be something like this (see ftp://ssd.jpl_process.nasa.gov/pub/ssd/horizons_batch_example.long for a complete description of JPL parameters)
[jplparams]
CENTER='@0'
OBJ_DATA=NO
MAKE_EPHEM=YES
TABLE_TYPE=VECTORS
VEC_TABLE=1
REFERENCE_PLANE=ECLIPTIC
REF_SYSTEM=J2000
OUT_UNITS=AU-D
CSV_FORMAT=YES
VEC_LABEL=NO
STEP_SIZE=1dCommand line tool
eph package also provides a command line tool to retrive ephemerides from services like JPL Horizons. To use it, open the terminal and type
$ eph 2007-11-17 2017-4-22 venusand you get ephemeris table of Venus starting from 2007-11-17 to 2017-4-22. You can also change the reference frame, time-step, output etc.. through the options provided. Check available options typing
$ eph --helpRelease history Release notifications | RSS feed
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