What if I don’t know my birth time?
You still have most of a chart. Every planet’s sign is usually the same all day; what you lose without a time is the rising sign and the houses, which change every few minutes, and, on some days, the Moon’s sign.
What changes during a day
- The rising sign, roughly every two hours, because the Earth turns a degree every four minutes. The houses are built on it, so they go with it.
- The Moon, which moves twelve to fifteen degrees a day and changes sign about every two and a half days. On roughly two days in five, it changes sign at some point, so the time decides which one you have.
- Almost nothing else. The Sun moves about a degree a day and the planets two at most, so they rarely change sign within one.
What we do without a time
We cast the chart for local noon, the one moment whose worst case is the same in either direction, and we don’t show what noon can’t know: no houses, no rising sign, and no hour pillar in BaZi. We follow the Moon across the whole day and tell you if it changes sign. Vedic planetary periods (dashas) aren’t dated at all without a time, because they shift by years across a single day.
Please don’t guess
A guessed time gives you a chart that looks complete and is quietly wrong, and nothing on it tells you which parts, so a chart that candidly says “we don’t know” is more useful than one that’s confidently off by two signs.
Where to find it
- The long-form birth certificate, in the many countries that record the time on it.
- Hospital records, or a baby book.
- Family. Even “early morning” narrows the rising sign down a lot.
Astrologers can also estimate a time by working backwards from life events, which is called rectification, and it’s an educated estimate rather than a measurement, so we don’t do it. If you find your real time later, correct it and the chart is worked out again. Why the time matters so much.