Contains static library, headers, example code and development manpages
The Swiss Ephemeris offers these advantages:
The Swiss Ephemeris is based upon the latest planetary and lunar
ephemeris, DE405/406, developed by NASA's Jet Propulsion
Laboratory. The original integration, DE405, covered the years 3000 BC
to 3000 AD and required 550 Mb of disk space. DE406 is a compressed
version of DE405 which requires 200 MB while maintaining a precision
of better than 1 m for the moon and 25 m for the planets. These data
have been further compressed with sophisticated compression techniques
developed by Astrodienst. The ephemeris now requires for the complete
6000 years only 5 Mb for all planets except the Moon, and 13 Mb for
the Moon. This compressed ephemeris reproduces the JPL data with 0.001
arcseconds precision. Astrodienst has extended the timespan of the JPL
ephemeris by numerical integration, so that Swiss Ephemeris covers the
years 5400 BC to 5400 AD, a total of 10'800 years. For this extended
timespan the ephemeris requires 32 Mbytes of ephemeris files.
All transformation steps from the inertial timeframe of the JPL DE406
integration to the reference frame for astrological coordinates (true
equinox of date), all corrections like relativistic aberration,
deflection of light in the gravity field of the Sun etc. have been
performed with utmost care and precision so that the target precision
of 0.001 arcsec is maintained through all transformation steps. Never
before has such a high precision ephemeris been available to
Swiss Ephemeris contains three ephemerides. The user can choose
whether he/she wants to use the original JPL DE406 data (if available
at his/her site), the compressed Swiss Ephemeris data (the default) or
a built in semianalytic theory by Steve Moshier. The Swiss Ephemeris
package switches automatically to the available best precision
ephemeris dependent on which installed ephemeris files it finds. Even
without any stored ephemeris files, using the Moshier model, planetary
positions with better than 0.1 seconds of arc precision are available
(3 arcsec for the Moon).
In addition to the astronomical planets as contained in the JPL
integration, Astrodienst has included all other bodies and hypothetical
factors which are of interest to the astrologer. Astrodienst has used
Astrodienst's own numerical integration program to provide ephemerides
for ALL known asteroids. There are over 55'000 of them and nobody will
be able to use them all. Astrodienst distribute these extended asteroid
files via Astrodienst's download area; there are also CDROMs available
with large sets of asteroid files. Asteroid reaserachers may be
interested in a December 1998 article in the Economist magazine about
the naming of asteroids.
Speed: The Swiss Ephemeris is precise and fast. On Astrodienst's Linux
test machine, a 1000 MHz Pentium III, Astrodienst compute 10'000 complete
sets of planetary positions, i.e. 10'000 x 11 planets, in 9 seconds.
This is 0.9 milliseconds for the complete set of exact planetary
(consecutive 1 day steps).
swemini - swemini.c
swemini A minimal program to test the Swiss Ephemeris.
Input: a date (in gregorian calendar, sequence
Output: Planet positions at midnight Universal time, ecliptic
swetest - swetest.c
swetest Swiss Ephemeris test program.
Swetest computes a complete set of geocentric planetary posi‐
tions, for a given date or a sequence of dates. Input can
either be a date or an absolute julian day number. 0:00