Swiss Ephemeris Info
AstroConnexions has a commercial license of the Swiss Ephemeris. The standard for astrological calculations and astronomical data.
To reduce download and upload times the Swiss Ephemeris data files are restricted to:
1BC to 5399 AD.
Please note that means AstroConnexions cannot calculate charts before or after these dates. This shouldn’t be a problem for the vast majority of astrologers.
Swiss Ephemeris version