Secondary Progressions & Solar Arc (推運與太陽弧)

Western predictive astrology — the catalogue's first forecasting engine, answering 'what is being activated THIS year?' from the birth chart. THREE linked time-techniques: SECONDARY PROGRESSIONS (the 'a day for a year' clock — the real sky advanced one day per year of life, giving the progressed Sun ~1°/yr, the progressed Moon a sign every ~2.5 yr, the progressed Ascendant/Midheaven by the Naibod key, and the 8-phase progressed lunation cycle); SOLAR ARC DIRECTIONS (the whole chart advanced as a rigid body by the solar arc ≈1°/yr, with the directed→natal contacts and the date each perfects — 1° of arc ≈ 1 year); and the SOLAR RETURN chart (the moment the Sun returns to its exact natal longitude each year, Newton-solved to the arc-second, with the Solar-Return Ascendant as the headline of the year ahead). Tropical zodiac. The astronomy is firm; the timing is symbolic — it does NOT calculate lifespan. Verified against Prince William's solar-arc Saturn (0° Scorpio at age 15.2, 1997).

Cost: 7 TIAN Points per call. tRPC procedure progressions.calculate.