How it works
The Signology method
Signology turns your birthday into a short reading, and every result in it is computed, so you can check it. The methods are long-standing ones: the tropical zodiac most Western astrologers use, Pythagorean numerology as Jean Simpson teaches it, and the traditional Chinese calendar.
Four rules behind every result
Measured sky positions, published tables
Signs and dates come from where the Sun, the Moon and the planets actually were, computed with Astronomy Engine and NASA JPL data. Chinese New Year dates match the Hong Kong Observatory's tables.
Checkable
Each lesson names its sources and shows how to check the result with a free public tool or a little arithmetic. Its worked example comes from the same code that runs the tools.
Tradition, for reflection
The meanings come from astrological and numerological tradition and are offered for reflection: a strength to notice, a question to sit with. None of them is a forecast.
One small, real step
Every reading ends with one small step you can take in ordinary life this week.
Six short lessons
Your Sun sign, cusp days and the 13th signWhy does another site give my birthday a different sign?Read the lesson
Your Moon sign without a birth timeWhy does Signology show two Moon signs for my birthday?Read the lesson
Life chapters: Saturn return, Uranus opposition, Chiron returnWhen is my Saturn return, and why do sites give different dates?Read the lesson
Life path and master numbersWhy is my life path 11 here when another site says 2?Read the lesson
Your personal year, birthday to birthdayWhy is my personal year number different here than on another site?Read the lesson
Chinese zodiac and the new-year dateI was born in January or February, so which Chinese zodiac animal am I?Read the lesson
What Signology never claims
- Signology does not predict events, dates or outcomes.
- It gives no verdicts on health, mental health, legal matters, money or relationships.
- It does not claim that astrology or numerology is a science.
- It claims no more precision than a birth date allows: no rising sign, and both signs when one changed that day.
- It says what is shared: your Sun-sign text is the same for everyone with that sign, while your planets, numbers and dates come from your birth date.
- It does not claim that NASA, JPL or the Hong Kong Observatory endorse it, and names them only as sources of data.
How AI is used
The reading texts were drafted with AI help and checked against written editorial rules. The calculations are plain code that gives the same answer every time, with no AI involved. Celeste, the guide in the Plus beta, is an AI and says so.
Where the data comes from
- Astronomy Engine: The Sun, the Moon, Mercury, Venus and Mars, the moments they change sign and the Moon's phase.
- NASA JPL: DE421 ephemeris and Horizons: Saturn and Uranus from DE421 and Chiron from Horizons, from 1930 to 2053, for the life chapters.
- Hong Kong Observatory: Its calendar tables match Signology's Chinese New Year dates for 1920 to 2045.
- Jean Simpson, Numerology: A Beginner's Guide to the Power of Numbers (DK, 2023): The method for the life path, the personal year and name numbers, including master numbers.