# Kundli without a birth time: what still holds, and what does not

Source: https://spolvero.design/articles/kundli-without-birth-time/
Updated: 2026-10-16
Tool: https://spolvero.design/tools/astrology/kundli/

> A kundli made without a birth time still gives every graha's rashi and nakshatra, so your Moon sign, Sun sign, most of compatibility matching and the day's panchang are reliable. What it cannot give is the lagna and the twelve houses, the nakshatra pada, the navamsa lagna and the Vimshottari dasha dates, because all of those depend on the exact minute. A tool should leave those out rather than assume noon.

Plenty of people know their birth date but not the time. Older certificates leave it out, hospitals rounded it, families remember "before lunch". The good news is that a kundli made without a time is not worthless; the honest news is that parts of it are, and a tool that fills in noon and carries on is quietly giving you a chart that may be wrong in exactly the places you were told to trust.

The [kundli maker](/tools/astrology/kundli/) has a "time unknown" box. This guide explains what it keeps and what it drops when you tick it.

## What still holds

**Every graha's rashi.** The Sun, Mars, Mercury, Jupiter, Venus, Saturn, Rahu and Ketu move slowly enough that the day alone fixes their sign almost always. Mercury and Venus, the quickest of them, cover about a degree a day; Saturn takes two and a half years to cross a sign. Your Sun sign in the sidereal zodiac is safe.

**The Moon's rashi, usually.** The Moon moves 13° a day. On most days it stays inside one 30° sign from midnight to midnight; on about two days in five it crosses a boundary somewhere in the day. The tool computes for noon and, when the Moon is near a boundary that day, tells you that a morning or evening birth could put it in the neighbouring sign. If your Moon is well inside a sign, your rashi is settled.

**The nakshatra, mostly.** A nakshatra is 13°20′ wide — almost exactly a day of the Moon's motion — so the same caution applies with a little more force. The tool prints the nakshatra for noon and flags a close call.

**The panchang at birth.** Tithi, vara, yoga and karana are read from the Sun and Moon and change through the day, so the values shown are for noon. The weekday, and usually the tithi, hold.

**Compatibility, largely.** Ashtakoota matching is read from the Moon's rashi and nakshatra, so a match can be scored on the parts that hold.

## What does not

**The lagna.** The ascendant sweeps through all twelve signs in a day. Without a time there is simply no lagna, and any tool that shows one has assumed a time. The kundli tool shows no house 1, and no houses at all.

**The houses.** Every house is counted from the lagna, so no lagna means no houses: not the 7th for marriage, not the 10th for work, not the 4th for home. A graha's rashi is known; its house is not.

**The nakshatra pada.** A pada is a quarter of a nakshatra, about 3°20′, which the Moon covers in six hours. Left out.

**The navamsa lagna.** The D9 ascendant changes every thirteen minutes or so; it is the single most time-sensitive thing in the chart. The navamsa signs of each graha are still shown, because they depend only on the degree; the D9 lagna is not.

**The dasha dates.** Vimshottari dasha starts from the Moon's exact position within its nakshatra. A 13° uncertainty in the Moon translates to as much as a full nakshatra of uncertainty in how far the first period had run — which can move every dasha boundary for the rest of your life by a year or more. The tool leaves the dasha table out entirely.

## What to do with an approximate time

If a relative remembers "around sunrise" or "late at night", enter your best guess and untick the box. The lagna changes about every two hours, so a guess within an hour is usually right, and the tool prints the lagna's degree so you can see how close to a boundary it falls. If it sits near one, try the two candidate times and see which lagna you get; a Jyotishi can often pick between two lagnas from known events, which is what birth-time rectification is.

What you should not do is enter 12:00 as if it were a fact. A chart is only as honest as its inputs, and the difference between "unknown" and "noon" is the difference between a chart that says what it does not know and one that hides it. The [Jyotish app](/astro/) follows the same rule: it has an explicit unknown-time path and never silently defaults to noon.

## Questions

### Can my Moon sign change depending on the birth time?

Sometimes. The Moon moves about 13° a day and a rashi is 30° wide, so on roughly two days in five the Moon changes sign at some point during the day. If your birth date is one of those, the tool cannot tell which side you were born on without a time; it computes for noon and says so.

### Is a kundli with time unknown good enough for matching?

For the eight kootas of Ashtakoota matching, mostly yes: they are read from the Moon's rashi and nakshatra, which usually hold. Manglik dosha, which depends on Mars's house from the lagna, cannot be judged without the time.

### How do I find my birth time?

The hospital discharge summary or birth certificate usually records it. Failing that, a parent or an older relative often remembers the part of the day. Even 'early morning' narrows the lagna to two or three candidates, and a Jyotishi can sometimes pick between them from known life events — a process called birth-time rectification.