How Innerglyph works

The chart row is keyed by month and day. The year is checked to make sure the date is valid; it does not change a standard Birth Card row. February 29 has its own chart entry.

For December 31, Joker is the Birth Card identity. It sits outside the standard 52-card catalog; the row separately lists Eight of Diamonds as its standard personality-card association and Planetary Ruling Card.

The Planetary Ruling Card or cards are also read from that date’s chart row. Innerglyph preserves the printed order and the chart’s relationship marks: “or” means alternatives, while “&” means the cards are paired.

The 52-day reading is a later calculation anchored to the first listed Planetary Ruling Card. That calculation does not create or replace the chart lookup.

For standard Birth Cards, Innerglyph starts the daily rotation from the row’s standard personality-card association. It advances through the 52-card catalog by elapsed UTC days since the most recent birthday anniversary.

Yearly Cards use a separate calendar-year calculation. The December 31 Joker row has no assigned daily or yearly result, while its chart-listed Eight of Diamonds Planetary Ruling Card still anchors the 52-day cycle.

The /daily experience needs a saved birthday to resolve a reading. If no birthday has been saved, it sends you back to the calculator first.