Chart Types
Learn about the progressed chart — its calculation, interpretation, and how to use it in your astrological practice.
Secondary progression applies a fixed ratio of 1 day of ephemeris = 1 year of life. The progressed positions are calculated by adding (age in years) days to the birth time, then generating a chart for that date and location. The progressed Sun advances approximately 1 degree per year, completing a full sign in about 30 years — this is the most commonly tracked progression. The progressed Moon advances roughly 12-14 degrees per month of progressed time (approximately 1 degree per month of actual life), completing a full chart cycle every 27-29 years.
The progressed chart differs from the transiting chart in a critical way: transits describe external conditions; progressions describe internal readiness. A transit of Saturn to the natal MC correlates with objective career events. A progression of the MC to an aspect with the natal Sun correlates with an internal shift in professional identity — regardless of external circumstances, the native is ready to think differently about their career. Progressions are the chart's internal clock, ticking at a rate determined by the native's birth moment.
Key progressed events include: progressed New Moon (every 29 years — a major developmental reset), progressed Moon changing signs (approximately every 2.5 years — a shift in emotional processing mode), progressed Sun changing signs (approximately every 30 years — a shift in core identity expression), and progressed planets aspecting natal planets (internal developmental milestones that may or may not have external correlates).
Transits describe environmental pressure. Progressions describe internal readiness. A transit of Jupiter to the natal MC means career opportunity is externally available. A progression of Jupiter to the natal MC means the native is internally ready for career growth — whether or not the external opportunity presents itself. The most powerful timing in predictive astrology occurs when transits and progressions align: the external condition (transit) meets the internal readiness (progression), and the native is both called and prepared for the same development simultaneously.
Start with the progressed Moon — it is the most dynamic indicator and the most useful for timing. Track when it changes sign (approximately every 2.5 years of life) and when it aspects natal or progressed planets. Next, review the progressed Sun: is it in the same sign as natal (first 30 years), the next sign (30-60), or the following (60+)? Each sign change of the progressed Sun marks a 30-year chapter of identity development. Then check progressed planets for aspects to natal positions — these are specific developmental milestones. Finally, note the progressed house cusps: the progressed MC, in particular, moves at a variable rate and its aspects to natal planets mark significant professional identity shifts.
No. The natal chart is the permanent foundation; the progressed chart is the developmental layer. The natal chart describes what is possible; the progressed chart describes when development in each domain is structurally available. The natal chart is always the primary document; the progressed chart is the secondary timing mechanism.
The progressed Moon is the fastest-moving progressed indicator and the most reliable timing mechanism. Its aspects to natal and progressed planets mark windows of approximately 2 months when the native is internally processing that planet's domain. A progressed Moon aspect to the progressed Venus correlates with a two-month window of heightened relational awareness, regardless of external circumstances.