astrorigin / pyswisseph

Python extension to the Swiss Ephemeris

Pyswisseph

This is the Python extension to the Swiss Ephemeris by AstroDienst.

The Swiss Ephemeris is the de-facto standard library for astrological calculations. It is a high-precision ephemeris, based upon the DE431 ephemerides from NASA's JPL, and covering the time range 13201 BC to AD 17191.

Usage Example

>>> import swisseph as swe
>>> # first set path to ephemeris files
>>> swe.set_ephe_path('/usr/share/sweph/ephe')
>>> # find time of next lunar eclipse
>>> jd = swe.julday(2007, 3, 3) # julian day
>>> res = swe.lun_eclipse_when(jd)
>>> ecltime = swe.revjul(res[1][0])
>>> print(ecltime)
(2007, 3, 3, 23.347926892340183)
>>> # get ecliptic position of asteroid 13681 "Monty Python"
>>> jd = swe.julday(2008, 3, 21)
>>> xx, rflags = swe.calc_ut(jd, swe.AST_OFFSET+13681)
>>> # print longitude
>>> print(xx[0])
0.09843983166646618

Links

Pyswisseph docs

https://astrorigin.com/pyswisseph

Python Package Index

https://pypi.org/project/pyswisseph

AstroDienst

https://www.astro.com/swisseph

Source code

Clone the Github repository with command:

git clone --recurse-submodules https://github.com/astrorigin/pyswisseph

Licensing

The Pyswisseph package adopts the GNU Affero General Public License version 3. See the LICENSE.txt file.

The original swisseph library is distributed under a dual licensing system: GNU Affero General Public License, or Swiss Ephemeris Professional License. For more information, see file libswe/LICENSE.

Test Suite

For now, the tests can be run with the standard python3 setup.py test command. For them to pass successfully, you need a basic set of ephemerides files installed somewhere on your system:

• seas_18.se1
• sefstars.txt
• semo_18.se1
• sepl_18.se1

All downloadable from https://www.astro.com/ftp/swisseph/ephe/

The path to the directory containing those files must be indicated in the environment variable SE_EPHE_PATH.

For example, on a system with the env command, you can do:

env SE_EPHE_PATH="/usr/share/sweph/ephe" python3 setup.py test

Credits

Author: Stanislas Marquis <stan(at)astrorigin.com>

PyPI/CI: Jonathan de Jong <jonathan(at)automatia.nl>