How Accurate Is an AI Astrologer?
An AI astrologer is exactly as accurate as any other reader: as accurate as the chart it reads from and the method it reads with. The tradition has never held that a reading is good because of who gives it. A chart calculated to the degree for the time and place of birth, delineated by the method of the texts, is a reading; a description generated from a Sun sign, or from positions remembered rather than computed, is not, whoever or whatever produces it. Two questions decide the matter: where the positions came from, and how they are read.
The chart comes first
Every position in a natal chart is a computed quantity: the longitude of each planet for the exact moment, the Ascendant and Midheaven for the exact place, the house cusps from those, the aspects from their differences, and, in Jyotisha, the ayanamsa applied, the nakshatra and pada of the Moon, the dasha balance from it, and the divisional charts. These come from an ephemeris, and the ephemeris is astronomy. There is no astrological content in the calculation and no room for interpretation; it is either done or not done.
A language model does not carry an ephemeris. Left to itself it recalls. It can usually produce the Sun's sign from a date, often the signs of the slow outer planets for a year, and sometimes a plausible Moon sign, and it will produce degrees, houses, and aspects in the same confident sentence, and those will be guessed. The Moon moves twelve to fifteen degrees a day, the Ascendant changes sign about every two hours, and the dasha balance turns on the Moon's exact longitude within its nakshatra; none of these can be recalled. A reading built on recalled positions is a Sun-sign reading wearing the vocabulary of a chart.
A calculated chart is one in which the positions were computed by an ephemeris routine from the birth data and supplied to the reader as fixed facts. An AI astrologer working from a calculated chart has the same starting point as a human astrologer with a printed chart in hand. The tradition's own practice already makes this separation: the astrologer casts the figure first and interprets second, and the casting is checked. Ptolemy opens the Tetrabiblos by distinguishing the astronomical part of the art, which is certain, from the prognostic part, in which the practitioner may err, and the same distinction settles this question.
Then the method
Given a correct chart, accuracy is a matter of method, and the method is what the texts teach. A reading is delineated: the planet, its sign, its house, its aspects, its rulerships, its dignity and sect, then the synthesis; in Jyotisha, the lagna, the Moon and its nakshatra, the yogas, the vargas, and the running dasha. Timing is by transit, profection, solar return, and dasha, with dates. A reading that names a placement and describes a temperament without weighing rulership and dignity, that says Saturn is transiting the seventh house without saying what rules the seventh and where that ruler sits, or that gives a Sade Sati without the Moon's strength and the dasha, is thin by the tradition's standard whoever gives it.
The test of an AI reading is the test of a human one: does it delineate, does it use the classical and modern canon, and does it state difficult periods plainly rather than softening them into encouragement or inflating a quiet chart into drama. Where the texts give more than one reading, a good reader gives the main ones and what distinguishes them, and says which tradition is in use when Western and Vedic differ. An AI reader can do this well, since the canon is large and it has read it; it can also do it badly, by averaging the canon into a generality. The reading, not the reader, shows which has happened.
What cannot be known without a birth time
The tradition is equally clear about limits. Without a birth time the Ascendant, the houses, the Midheaven, and the dasha balance are unknown, and the Moon may be uncertain by up to a sign. A reading that gives houses for a person with no birth time has invented them, and the honest answer from any reader is to say what can be read, the planets by sign and their aspects to one another, and what cannot. Rectification, the recovery of a birth time from the dates of known events, is a technique in the texts, but it is work done on a chart, not a substitute for one.
The question as the tradition hears it
Asked whether a reading is accurate, the tradition answers by asking for the chart and the method. A reader with a calculated chart, the canon from Valens and Lilly to Robert Hand, or from Parashara to B. V. Raman, and the discipline to read difficulty in either direction gives an accurate reading. A reader without a chart gives an opinion about a Sun sign. That has always been the line, and an AI astrologer falls on one side of it or the other for the same reasons a human one does.