I published the full 366-date Cardology map
The complete Cardology birthday chart: all 366 dates
Two Cardology calculators should not give you two different birth cards for the same birthday.
That is not a mystery. It is a data problem.
I published the complete birthday map used by Card Blueprints: all 366 month-and-day combinations in one downloadable CSV. You can inspect it, search it, sort it, or compare it against another chart.[1][2]
Download the 366-date Cardology birthday map
What is in the file
The map has one row for every possible calendar date. Each row includes the month and day, human-readable date, birth-card code and full card name, rank and suit, solar value, canonical card-meaning page, birthday page, exceptional-day rule, methodology URL, and dataset version.
There are 365 standard-card rows and one Joker boundary row. The file is generated from the same verified mapping used by the live Card Blueprints calculator, rather than being copied by hand from a chart.[1][2][3]
A few spot checks: January 1 is King of Spades; January 15 is Queen of Diamonds; February 29 is 9 of Clubs; August 15 is Jack of Clubs; and December 31 is the Joker boundary.
The two dates that expose bad charts
February 29 is easy to lose when someone builds a birthday table from a non-leap year. In this map, February 29 resolves normally to the 9 of Clubs.[1][2]
December 31 needs different handling. Its public result is the Joker boundary with solar value 0. The dataset does not force that date into a standard card or invent a card page for it.[1][2]
Those two rows are useful tests. If a chart skips leap day or turns December 31 into an ordinary card without explaining the rule, you are not looking at the same implementation.
What “fixed” means here
The date-to-card layer is deterministic. Give the system the same month and day and it returns the same mapped result. You do not take a quiz, choose the card that sounds best, or draw one at random.[1]
That does not make every Cardology claim a scientific fact.
The mapping is the mechanical layer. Personality, relationship, timing, and life-pattern meanings are the interpretive layer. I use those meanings as pattern language for reflection, not as medical, psychological, legal, or financial conclusions.[1]
Keeping those layers separate matters. A calculation can be reproducible while its interpretation remains something you test against lived experience.
Why publish the raw table
Most people only need the calculator. Enter a birthday and it gives you the card.[3]
The raw file is for anyone who wants to check the work: writers, researchers, teachers, developers, readers comparing systems, or the person who simply wants to know why two websites disagree.
You can download the CSV and search for a date in seconds. Every standard-card row links to the full card meaning, and every date links back to its birthday page.
If you cite or reuse the map, use this source line:
Card Blueprints. Cardology Birthday Map: 366 Date-to-Card Mappings. Version 2026-08-15. https://cardblueprints.com/data/cardology-birthday-map.csv
The full calculation notes and claims boundary are on the Cardology Methodology page.[1]
Find your row
You can use whichever format fits how your brain works:
Use the free birth-card calculator
Browse all 52 birth-card meanings
The calculator is faster. The file is there when you want receipts.
Sources
[1] https://cardblueprints.com/methodology — Cardology Methodology
[2] https://cardblueprints.com/data/cardology-birthday-map.csv — Cardology Birthday Map CSV
[3] https://cardblueprints.com/birth-card-calculator — Birth Card Calculator and Chart