last updated May 9, 2011.

The package "Riyal_for_Windows.exe" contains version 3.50. Please go to the download page:

http://www.expreso.co.cr/centaurs/riyal.html

changes made from version 3.13 to 3.50:

- the "internal" objects list has been completely updated and reduced in size
- all the ephemerides have been re-calculated with the latest orbital elements
- updated "all named asteroids" and "all distant objects"
- added Ceres, Pallas, Juno, and Vesta 1700-2020
- added geocentric ephemerides of heliocentric empty focus of planets
- improved accuracy of outer planets (DE421 instead of DE406)
- added option to calculate demi-solar returns
- removed option to calculate regular planets with the Swiss Ephemeris
- user-selected list of asteroids is now shown separately in the "Swiss Ephemeris" listing

changes made from version 3.121 to 3.13:

- fixed last selected planet displayed in tables
- fixed convergence error (loop forever) in mundane longitudes
- fixed identification error in "test position accuracy" of asteroids
- fixed error trapping and handling of Swiss Ephemeris asteroids.

changes made from version 3.1 to 3.121:

- fixed error in oblique longitudes of objects without latitude
- added "in mundo" or "oblique" zodiacal longitudes
- mundo positions extended to most house systems
- added trapping of errors of chaotic Swiss Ephemeris centaurs
- fixed some problems with chaotic orbits in "swiss ephemeris" mode
- fixed issues in v.3.1 when terminating the program
- the "long" ephemeris file now comes included in the package
- fixed error in calculation of osculating elements in "swiss ephemeris" mode
- better Swiss Ephemeris file and range error trapping
- fixed error in positions of Jupiter through Neptune (3.101)

changes made from version 3.0 to 3.1:

- added user-defined list of Swiss Ephemeris asteroids
- added simple file error message at start-up
- added some missing simple input error messages
- re-designed "equatorial to zodiacal conversion" dialog
- more accurate planetary aberration algorithm
- better Nutation model (IAU 2000B)
- more Swiss Ephemeris integration
- revised delta-t for dates before 1620
- outer planets back to the DE406 standard

Juan Revilla