The Astrolium secondary progressions calculator returns your progressed chart for any year between 1900 and 2100. Secondary progressions are the day-for-a-year technique: the chart 30 days after your birth becomes your chart at age 30. The progressed chart you see here is built on that method. Math runs on the Swiss Ephemeris in under 30 seconds. No login, no email, no upload.
The wheel shows all 10 planets, the progressed angles, and the progressed Moon's current house. Most working astrologers use secondary progressions to track slow inner change while transits handle outer events.
The full reading sits inside the progressions feature, where secondary progressions and solar arc directions stack against transits on one scrubber. For the interpretive framework, read the secondary progressions guide. For the sibling annual technique, see the solar return chart calculator. For the $29 per month Pro tier, see pricing.
What you get
Secondary progressions are the day-for-a-year technique. Take the ephemeris position from 30 days after birth — that's your chart at age 30. Each year of life advances the planetary positions by one day. The progressed Sun moves about 1 degree per year. The progressed Moon moves about 13 degrees per year, completing one full cycle through the zodiac in roughly 27.5 years.
Placidus de Tito systematized the technique in the 17th century. The math has not changed since. What's changed is the rendering time: a manual progressed chart used to take an experienced astrologer 20 minutes with an ephemeris and a sheet of graph paper. Astrolium produces it in 300 ms. For the full interpretive method, read the secondary progressions guide.
The three layers the calculator returns
The progressed wheel
The full chart cast for the day that corresponds to your target year. All 10 planets, both luminaries, the Ascendant and Midheaven. The wheel looks like a natal chart because it is one, just at a different epoch. The differences from your natal chart are the timing.
The progressed Moon's house
The single most useful piece of information in the technique. The progressed Moon moves through one whole-sign house every 2.5 years. Each ingress flips the inner chapter: what you care about, the texture of the daily mood, the emotional question of the season. Astrolium flags the current house and the next ingress date directly on the chart.
Progressed-to-natal aspects
When a progressed planet forms an exact aspect to a natal point, the timing surfaces. A progressed Sun crossing a natal Saturn at age 33. A progressed Venus opposing natal Pluto at age 41. These contacts mark the years when the slow inner clock crosses one of your natal structural points. Astrolium computes them within a 1 degree orb. Combine this read with the profections calculator to see which natal planet is time-lord of the year the progression perfects.
How the calculator works
Drop your birth data (date, time, place) plus the target year. The math runs in your browser on the Swiss Ephemeris, the same library Solar Fire and Astro Gold use under the hood. Absolute positions match to the arc-second across the full 1900 to 2100 range.
Whole-sign houses are the historical convention for progressed-Moon house tracking, the system most working astrologers use for this technique. Astrolium supports 6 systems (Placidus, Whole Sign, Porphyry, Equal, Koch, Regiomontanus) switchable from the dropdown without re-entering birth data.
Nothing is stored. Nothing is emailed. We don't know who you are.
After the calculator
A single progressed chart is a snapshot. The reading happens when you scrub across years and see the progressed Moon move through houses, the progressed Sun change sign, the progressed inner planets cross natal points. That requires a ribbon, not a one-off wheel.
The full progressions workspace stacks secondaries and solar arc on the same scrubber as transits: Bernadette Brady's framing of progressions-as-manifestation alongside transits-as-events, on one screen. See the progressions feature for that workspace.
For the deeper reading method (how the progressed Moon's ingresses get read, how to interpret a progressed Sun changing sign, what to do when the progressed Ascendant changes sign mid-life) see the secondary progressions guide. For practitioners running progressions across a roster, the pricing page covers the $29 per month Pro tier.
Cross-link
Run related timing techniques: profections calculator, Saturn return calculator, solar return chart calculator, Jupiter return calculator. For the predictive feature stack, see predictive timing and the progressions feature.