What this graph adds to a progressed chart
A normal progressed wheel shows longitudes around the zodiac. This graph follows a different coordinate: declination, the angular distance north or south of the celestial equator. The vertical scale runs from 30° south through the equator to 30° north. Each colored curve is one body’s secondary-progressed declination; the horizontal bands belong to the selected natal planet.
Where a progressed curve meets the blue natal line, the two factors are parallel. Where it meets the rose mirror line on the other side of the equator, they are contra-parallel. Those contacts can happen without a conjunction or opposition in zodiac longitude. The result therefore complements the secondary progressed chart rather than replacing it.
The day-for-a-year clock
At age 30, this calculator looks 30 ephemeris days after the birth instant. At age 30.5, it looks 30.5 days after birth. Approximate life dates use a tropical year of 365.2422 days, while the calculated sky uses the symbolic ephemeris instant. Both dates remain visible in the contact table and CSV so the mapping can be checked without confusing a progressed date with an actual transit date.
Monthly age samples form the displayed curves. Exact crossings are refined between those samples. The chosen orb controls the shaded bands and sampled window table; it does not change the exact contact times. Read the progressed declination guide for a worked example and the limits of the calculation.