The Chart Room
Drawn in your browser. Corrected in the open. Nothing leaves this page.
Every chart here is computed on your own device from classical rules: civil time restored through the IANA time-zone database, converted to true solar time at your exact longitude, and cast into twelve palaces with the pillars shown in both calendric calibers. If the two calendars disagree about you, you will see it — in a footnote, not a guess.
Regression fixtures
Three boundary cases verified in our calculation engine — load one to watch the transparency layer fire.
The chart room is empty.
Enter your birth data and draw — or load a regression fixture to see how the transparency layer reports a daylight-saving restore, a dual-calendar disagreement, or a Late-Rat birth.
What the transparency layer is telling you
The four-pillar table shows two calibers side by side. Solar terms (orthodox) is the classical school: the year pillar turns at Lìchūn, the month pillars at the twelve solar terms. Engine (lunar-calendar) is what our calculation engine's internal lunar boundary produces, shown because some classical software resolves the same boundaries differently. When they disagree about your year or month, the dual-calendar note appears — that is the honesty layer doing its job, not an error.
The dataset lookup key identifies your chart's twin in our 674,976-reading corpus — the same key our report pipeline uses. A birth in the Late Rat hour (23:00–24:00 true solar time) resolves by the classical aliasing rule to the next day's Early Rat hour; the notice says so plainly. Daylight-saving restorations are reported, never silently applied.
This page is the free half of the promise. The paid half — a thirteen-theme editorial report on a chart like yours, citations and review badges attached — is on display here.