swephR v0.2.0

July 4, 2019
By

(This article was first published on R on Ralf Stubner, and kindly contributed to R-bloggers)

This morning swephR version 0.2.0 made
it unto CRAN and is now
propagating to the mirrors.

The goal of swephR is to provide an R interface to the
Swiss Ephemeris, a
high precision ephemeris based upon the DE431 ephemeris from NASA’s
JPL. It covers the time range 13201 BCE to 17191 CE.

The new version 0.2.0 brings two important changes. First, the version of the
included Swiss Ephemeris has been updated to the current version 2.08. Upstream’s
release notes
list several changes. Most relevant for users of the package is the update to
current Delta T and the fixes to the star functions. Internally, this release
includes most of the patches we had created in the process of getting the package
unto CRAN, simplifying future updates. Unfortunately, we learned that the links
to certain sections of the programmer’s documentation
are not stable between updates and had to be replaced with a generic reference.

Second, following a feature request
for some Astrology related functions, the
coverage of the C API has been extend. In particular, the following functions
are now supported:

Section 10: Sidereal mode functions

  • swe_set_sid_mode(sid_mode, t0, ayan_t0)
  • swe_get_ayanamsa_name(sid_mode)
  • swe_get_ayanamsa_ex_ut(jd_ut, iflag)
  • swe_get_ayanamsa_ex(jd_et, iflag)

Section 13: House cusp, ascendant and Medium Coeli calculations

  • swe_houses_ex(jd_ut, cuspflag, geolat, geolon, hsys)
  • swe_houses_armc(armc, geolat, eps, hsys)
  • swe_house_name(hsys)

Section 14: House position calculations

  • swe_house_pos(armc, geolat, eps, hsys, xpin)
  • swe_gauquelin_sector(jd_ut, ipl, starname, ephe_flag, imeth, geopos, atpress, attemp)

Section 15: Sidereal time

  • swe_sidtime(jd_ut)

Please use the issue tracker for feedback such as
questions, comments, feature requests or bug reports.

To leave a comment for the author, please follow the link and comment on their blog: R on Ralf Stubner.

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