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47 lines
1.3 KiB
Markdown
47 lines
1.3 KiB
Markdown
## Test data for converting GAL/EQJ
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This directory contains data generated by the [JPL Horizons](https://ssd.jpl.nasa.gov/horizons.cgi)
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online tool with example conversions between equatorial J2000 (EQJ)
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and galactic (GAL) coordinates.
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Here are the steps to reproduce this test data on JPL Horizons:
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1. Ephemeris Type = OBSERVER
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2. Target Body = Mars (499)
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3. Observer Location = Geocentric (500)
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4. Time Span: Start=2021-06-06, Stop=2031-06-06, Step=100 days
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5. Table Settings: check boxes 1 (Astrometric RA, DEC) and 33 (Galactic lon, lat).
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6. Also on Table Settings, change angle format to decimal degrees;
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airless (no refraction); enable extra precision.
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7. Set Display Output to plain text.
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8. Generate the data, Ctrl+A, Ctrl+C to copy to clipboard.
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Paste into editor. Add an extra blank line at the end, and save.
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Here are the equivalent "batch file" settings:
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```
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!$$SOF
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COMMAND= '499'
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CENTER= '500@399'
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MAKE_EPHEM= 'YES'
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TABLE_TYPE= 'OBSERVER'
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START_TIME= '2021-06-06'
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STOP_TIME= '2031-06-06'
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STEP_SIZE= '100 d'
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CAL_FORMAT= 'CAL'
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TIME_DIGITS= 'MINUTES'
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ANG_FORMAT= 'DEG'
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OUT_UNITS= 'KM-S'
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RANGE_UNITS= 'AU'
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APPARENT= 'AIRLESS'
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SUPPRESS_RANGE_RATE= 'NO'
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SKIP_DAYLT= 'NO'
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EXTRA_PREC= 'YES'
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R_T_S_ONLY= 'NO'
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REF_SYSTEM= 'J2000'
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CSV_FORMAT= 'NO'
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OBJ_DATA= 'YES'
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QUANTITIES= '1,33'
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!$$EOF
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```
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