Birth chart calculator

Birth chart calculator for unknown birth time

Start with the birth date and city you actually know. If the hour is missing, LifeSense does not guess it; it shows which birth chart fields are still usable and which ones need an exact time.

What you can still use
  • Date-based BaZi pillars and non-hour facts where the engine can verify them.
  • Western and Jyotish planetary positions that do not require a precise local hour.
  • A chart export with birthTimeConfidence marked as unknown_time.
  • Location, timezone, and true-solar-time basis fields when city resolution is available.
What not to trust without the hour
  • Hour pillar precision, ascendant, house cusps, and other hour-sensitive fields.
  • Zi Wei chart facts unless exact-time chart data and runtime support are available.
  • Any interpretation, advice, prediction, generated reading, or narrative claim.
  • A precise birth-time Passport. Unknown time remains low confidence by design.
Who this calculator helps
  • People comparing BaZi, Western astrology, Jyotish, and Zi Wei from one birth record.
  • Users who do not know the exact hour and need honest unknown-time limits instead of a guessed chart.
  • Families, students, and note-takers who want a portable chart record they can save or print.
How it adds value
  • One input flow resolves city, timezone, time confidence, chart facts, and export formats.
  • Four chart systems can be reviewed side by side while each method keeps its own labels.
  • The page shows what is available, approximate, low confidence, or unavailable before the user trusts a result.

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FAQ

Can I calculate a chart without birth time?

Yes. LifeSense can calculate available chart facts and marks the result as unknown_time instead of pretending the time is precise.

Does true solar time fix an unknown birth time?

No. True solar time adjusts a known local time using location. If the hour is unknown, hour-sensitive facts remain limited.

Will this page give me an astrology reading?

No. LifeSense is a deterministic chart calculator. It does not provide readings, predictions, or advice.