Classical Astronomy Astrology

Shane St. Pierre

In-app purchases

About this app

Most astrology apps ask you to believe. This one shows its work.

Classical Astronomy & Astrology is built for the revival: whole-sign houses, sect, annual profections, zodiacal releasing, the Lots, the seven classical planets, the ancient art of Ptolemaic and Hellenistic astrology, auditable line by line. One deterministic engine runs it all: a custom double-epicycle ephemeris for the sky, JPL Horizons for the charts.

THE ENGINE COMPUTES. THE AI EXPLAINS.
A deterministic classical engine computes your chart's testimony, 1,171 authored components against 2,373 conditions, so the same chart returns the same reading, word for word, every time. No AI writes your reading.

Then, if you want to talk it through, the optional AI Astrologer answers questions, using only what the engine already computed. A model with no chart has nothing to invent a placement from. It recalls the tradition; it does not compose it.

ASK YOUR CHART
Ask what your chart lord is doing, the condition of any house lord, your Lots, this year's profection and Lord of the Year, your releasing periods, a bond across twelve classical lenses, or what transits are doing to your nativity. You get a real argument from your placements, receipts attached. When the tradition is silent, it says so. Your first reading is free, and an answer it can't ground back to your chart costs you nothing.

IT SHOWS THE MATH
The planets move on nested circles of deferent and epicycle, the Ptolemaic model held for fourteen centuries. Stand under the dome, point your phone at the sky, or watch the orrery turn at five speeds.

IT CITES ITS SOURCES
Every verdict names the placement it rests on and the source it comes from: Ptolemy's Tetrabiblos, Dorotheus, Valens, Māshāʾallāh and the tradition that carried the art from Hellenistic Egypt through the Persians and Arabs. Tap any section for the working underneath.

IT TEACHES THE METHOD
Terms are underlined: tap for a definition, hold for the full sourced entry. A free fifteen-lesson course walks the doctrine through a live chart, in the order the ancients taught.

YOUR BIRTH CHART
Cast as the tradition casts it: whole-sign houses, five classical aspects, the five essential dignities, sect, solar conditions, and the royal fixed stars. Then your chart ruler, temperament, strongest and weakest planets, and three Lots.

YOUR YEAR AHEAD
In the order the ancients ranked it: primary directions first, then profection, solar return, eclipse activations, and confirming transits. When techniques agree, the app says so. When they don't, it says that too.

COMPATIBILITY & SYNASTRY
Classical synastry across twelve relationship lenses: marriage, business, mentor, parent and child, and more, scored on the same contacts. Not sun-sign matching.

THE PDF LIBRARY
A natal report of 30 to 50 pages with seven appendices, typeset like a book. Twelve bond readings plus a synthesis, and a chart sheet free to share, all made on your phone.

THE DIMBLEBY ECLIPSE CLOCK
A custom eclipse engine on J. B. Dimbleby's cycle theory (All Past Time, 1894): 35,387 eclipses from 4000 BC to AD 3648, offline.

OFFLINE AND PRIVATE
Switch to the built-in ephemeris and everything runs offline. No account, no ads, nothing leaves your device. Your name never travels to the model. Only the chart's facts do.

WHAT'S FREE
The whole astronomy half, your chart wheel with every dignity and aspect, the classical reading of all thirteen sections, the daily dashboard, the course, and your first AI reading.

PAY ONCE
One purchase unlocks the synthesis layer, all twelve bond modes, the predictive work, and the PDF library. No subscription or auto-renewal. After the free reading, questions come in packs when you want them.

LANGUAGES
Fully localized in English, Spanish, Portuguese, German, and Czech: every screen, the AI Astrologer, and all PDF exports.

Sky, chart, lesson, bond: one calculation from first circle to final verdict. Nothing invented, nothing hidden, no subscription.

Ratings and reviews

phenomenal tool. where others have fallen short and give AI generated information that seems very bland, this gives in depth information that fills in the "blanks." I have been studying astrology for roughly 30+ years (raised in the realm). this app has helped fill places that I have been unable to interpret or understand when it comes to myself or bonds with my children as well as giving a different perspective to attempt. so far the perspectives have helped. great tool

This quickly became my favorite astrology app! So insightful and full of knowledge to interpret your birth chart!

⭐️⭐️⭐️⭐️⭐️ A Refreshing Return to Observational Astronomy Shane St. Pierre’s Classical Astronomy app is a standout tool for anyone interested in understanding the sky as it actually appears from an observer’s perspective. Instead of overwhelming users with abstract models or overly complex astrophysics data, this app brings the focus back to traditional, observational astronomy—the foundational science of celestial tracking that navigators and astronomers used for centuries.

What’s new

Added complete chart customization options.
Upgraded Synthesis Unlock with more personalized permanent readings
Expanded Horoscope mode into the full Timelords toolkit
Now fully localized in Spanish, Czech, German, and Portuguese.
Added a plain text mode for all PDF exports.
Rebuilt birth-data entry: type the date and time directly, edit any saved chart, with safer unknown-time and daylight-saving handling