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Rectification

For someone whose birth time is uncertain: from the dates of life events, list the times at which transits, solar arcs and the progressed Moon hit the ASC/MC most, as candidates.

This lists candidates and their evidence; the astrologer decides. Enter at least 3 events, ideally 5–10 (marriage, births, moves, job changes, illness, bereavement — days when life changed). Events are taken at noon.

Birth date and place

Year

Month

Day

UTC offset

Place

Lat.

Lon.

Time range to search

Approx. hour

min

Range

Whole day (0:00–24:00)

Step

Events (date and note)

Year	Month	Day	Event

Events are saved on this device, attached to this person.

Method (the formula)

Candidate times step through the range; for each, the ASC and MC are computed at the birthplace. For each event date the following hits are counted.

T: transiting Jupiter, Saturn, Uranus, Neptune, Pluto to ASC/MC at 0°, 90°, 180° within 1° (weights Saturn/Pluto 1.2, Uranus/Neptune 1.0, Jupiter 0.8)
SA: solar-arc directed natal bodies to ASC/MC, and directed ASC/MC to natal bodies, same angles within 1° (weight 1.0)
P: the secondary-progressed Moon to ASC/MC, same angles within 1.5° (weight 0.8)
Each hit scores weight × (1 − orb ÷ allowed orb). A candidate's score is the sum over all events. Local peaks are listed highest first, up to 5, dropping peaks within 12 minutes of a higher one.

Same calculation as Positions (JPL Horizons tables; Moon from Astronomy Engine). Events are taken at noon in the birthplace's offset. Natal longitudes are taken at the middle of the range (they do not move within minutes). The orb settings page is not used here (fixed orbs).

Once you choose, “Use this time” puts it into the current person, and the chart wheel and Positions open with it. Scores are for comparison, not probabilities.