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Secondary Progressions Calculator

Compare natal planets with their day-for-a-year progressed positions for a chosen UTC date. This is a symbolic astrological timing method, not a forecast of events.

STAR & SIGIL

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Enter birth details and a target date

Recorded birth details

One tropical year of age (365.24219 days) advances the ephemeris one day after birth. Planetary positions use the symbolic ephemeris moment. Progressed angles and houses are omitted because several competing methods exist.

How secondary progressions work

The technique treats the days after a recorded birth moment as years of life. A person aged 30 years is compared with the sky around 30 days after birth. The positions are astronomically calculated for that symbolic date; the mapping to a life date is an astrological convention.

Compare the progressed Moon and inner planets with natal positions. Planetary aspects below use a 1° orb and are descriptive geometry, not a prediction.

Method and limits

The day-for-a-year key

This calculator uses one ephemeris day per 365.24219 days of life. It converts the recorded local birth time with its historical UTC offset, finds the age at the selected UTC date, and calculates the planetary sky at the mapped symbolic instant.

Reading both charts

The result shows a progressed wheel and planetary positions beside the natal positions. Close progressed-to-natal conjunctions, sextiles, squares, trines, and oppositions use a 1° orb. This geometric comparison is part of an astrological timing convention, not a prediction.

Missing birth time

When the time is unknown, a 12:00 UTC sample on the birth date can illustrate the method, but the progressed Moon and event timing are uncertain. The sample is prominently labeled. Progressed angles and houses are omitted in all cases because several competing methods exist.

Open the expanded Secondary Progressions Calculator view →