Hi K.,
There are a number of astrological programs available in this very Museum of HP, namely:
HP-67 Astrology Solution Book (ported to HP-41C)
Astro 1 - Mean Obliquity of Ecliptic & GST
Astro 2 - Moon Asc Node, Nutation, Vernal Pt
Astro 3 - Local Siderial Time, Geocent Lat
Horoscope Construction
House Cusps - Campanus Methods
House Cusps - Koch Methods
House Cusps - Placidus Method
House Cusps - Regiomontanus Methods
House Cusps - Topocentric Methods
Mundoscope, Campanus
Mundoscope, Regiomontanus
follow this link and scroll down till you find the individual links for each program.
They seem to be available in its original form for the HP-67, and here you'll find the 41C versions, translated automatically using the card reader, so you could run them using either an HP-67, HP-97, HP-41C, HP-41CV, HP-41CX, or an HP-42S.
Best regards from V.