The method stays visible.

We validate your birth record, resolve historical local time, calculate a chart with a deterministic engine, then attach versioned interpretation rules. The current free preview uses authored rules, not live GPT writing. AI never calculates the pillars.

In this release, only Seoul births from 1990 through today use the existing chart engine. Tokyo, Taipei, New York, Los Angeles, Chicago and Phoenix support historical time checks, but their personal charts are not yet validated. Uncertain times stay uncertain; nonexistent times are not shifted automatically.

The day changes at local midnight. The hour at 23:00 uses that civil day. Year and month boundaries use solar-term instants with a two-minute uncertainty guard. True solar time, luck-cycle starts and unverified extra techniques are excluded.

Terra medium is the candidate for full local-language reports; Luna low is the candidate for brief summaries and follow-up explanations. Account availability and multilingual generation have not been verified in this release. Native-language review is pending.