Accuracy Update: We Audited Every Calculation on Zodaiya

Why we did this

Zodaiya's promise has always been simple: the astronomy is calculated first, and the symbolism is interpretation, clearly labeled. That promise only means something if the calculations are actually right. So we ran a full data-integrity audit of every calculated system on the site — Western chart math, the Chinese Four Pillars, the Mayan Tzolkin, Vedic sidereal signs, the Egyptian-inspired decans, numerology, tarot birth cards, and the timing tools — checking each one against independent astronomical references rather than our own output.

What we corrected

Rising signs. The formula behind the Rising sign contained a sign error that returned the point setting on the western horizon instead of the point rising in the east — the exact opposite sign. This affected every Rising sign the site displayed. It is fixed, and the fix is verified by a test that checks a physical fact: at sunrise, the rising point must sit where the Sun is.

Moon signs on cusp days. On days when the Moon changes sign, some parts of the site computed your natal Moon at a default hour instead of your saved birth time — so one section could say Sagittarius while another said Capricorn. Every Moon calculation now uses your birth time when you have provided one.

The moon-phase widget. It previously estimated illumination with a shortcut formula and, when it could not compute the Moon's sign, displayed an approximation that was not a real calculation. It now uses the same astronomical engine as the rest of the site, and when something cannot be computed it is omitted rather than guessed.

Chinese Four Pillars. The day pillar was counted from a widely-copied but incorrect reference date, which shifted the day's earthly branch — the animal of the "spouse palace" — by four positions for everyone. The count is now anchored to a verified reference and cross-checked against published historical dates.

Mayan day-signs. The Tzolkin count ran in the wrong direction from its anchor date, so day-signs drifted away from the true 260-day cycle. It now advances the way the calendar actually does.

Vedic signs in early January. A boundary-ordering mistake gave January 1–13 birthdays the wrong sidereal sign (Capricorn instead of Sagittarius).

Egyptian decans. Two internal copies of the decan table had drifted apart, so different parts of the site could name a different decan for the same birthday. There is now one table, and an automated check keeps every copy identical.

What checked out

Plenty. The numerology arithmetic (including master numbers), the tarot birth-card method, the Chinese year, month and hour pillars, the Celtic and Norse date tables, the planetary positions behind every daily reading, and the deterministic compatibility scoring all verified correctly against independent references. Daily readings are generated from computed sky positions that are injected as fixed evidence — the AI is not allowed to invent astronomical facts, and that held up under review.

How we keep it correct

Every correction above ships with an automated regression test that runs before any deploy, most of them checking against independently derived astronomical truth rather than stored answers. The full methodology — including this update — lives on our How Zodaiya Works page, which now carries a permanent accuracy changelog.

If a reading you saved earlier shows different values today — a new Rising sign in particular — the new values are the correct ones. Astrology on Zodaiya remains symbolic reflection, not prediction; but within its own systems, the arithmetic should be right, and now it is.