Quick answer: You need four things — your date of birth, your time of birth as precisely as you can get it, your place of birth (town, not country), and the time-zone rule that applied at that place on that date. Everything a Kundli shows is derived from those four inputs, which is why getting them right matters more than any other choice you make.
The Four Inputs, and What Each One Decides
Each birth detail controls a different layer of the chart. That is the useful way to think about it, because it tells you what goes wrong when one of them is off:
| Detail | What it determines | What breaks if it is wrong |
|---|---|---|
| Date of birth | Positions of the slower planets, and the sign and Nakshatra of the Moon | Almost everything — a wrong date produces a different chart, not a slightly imprecise one |
| Time of birth | The ascendant (Lagna), the house layout, and the exact Moon degree that sets your Dasha sequence | Houses shift, so which life area each planet sits in changes; Dasha timing drifts |
| Place of birth | Latitude and longitude, which fix the ascendant degree for that moment | Using a country or capital instead of the actual town moves the ascendant |
| Time zone in force that day | Converts local clock time to universal time before calculation | A one-hour error, which can move the ascendant into the neighbouring sign |
Date of Birth: Watch the Midnight Edge
Date is usually the easiest input, with one recurring trap: births close to midnight. If you were born at 00:20, the date is the new day, not the evening you remember being told about. Family memory tends to compress “late on Thursday night” and “very early Friday” into the same story. Where a birth certificate exists, trust the document over the anecdote.
Time of Birth: Precision Versus Accuracy
Time is the input people worry about most, and rightly — it drives the ascendant and the house layout. A useful distinction: a recorded time of 14:05 is precise, but if the person writing it glanced at a clock ten minutes after the birth, it is not accurate. Recorded hospital times are usually good to within a few minutes, which is fine for most purposes.
What you should not do is invent a time to fill the field. A guessed 12:00 produces a chart that looks complete and is confidently wrong about houses and ascendant. If your time is genuinely unknown, there are better options than guessing, and we go through them in what to do if you don’t know your exact birth time.
Place of Birth: Name the Town
Give the town or city where the birth actually happened, not the region, not the nearest big city, and not where your family lived at the time if that differs. Coordinates are what the calculation uses, and a hundred kilometres is enough to shift the ascendant degree noticeably.
Two practical cases. If you were born in a small village that calculators do not recognise, give the nearest recognised town and say so — that is a much smaller error than substituting the capital. If the place name has changed since your birth, give both the old and current name so there is no ambiguity about which location is meant.
The Detail Almost Everyone Forgets: Historical Time Zones
This is the input that quietly ruins otherwise careful charts. A birth time has to be converted to universal time before anything can be calculated, and the rule for that conversion is whatever was legally in force at that place on that date — not the rule in force today.
Concretely: India standardised on a single time zone, but many other countries have changed their offsets, split zones, or run seasonal clock changes that started and stopped in different years. Someone born in Europe in July may or may not have been on summer time depending on the year and country. If your birth certificate records a local clock time, that time is only meaningful together with the rule that applied then. Good calculation software handles historical zone data automatically; if you are entering details manually somewhere, this is the field worth double-checking.
What You Do Not Need to Provide
A short list, because over-collection is common. A Kundli does not need your current address, your marital status, your job, your photograph or your family’s birth details. None of those enter the calculation. If a service asks for them, they are being used for something other than computing your chart — which may be legitimate, but it is worth knowing the difference.
You also do not need to supply your own interpretation of your chart. Where the reading comes from, and what separates a thorough one from a thin one, is covered in what makes a good birth chart analysis.
A Quick Self-Check Before You Submit
- Is the date the calendar date of the birth itself, including for births just after midnight?
- Is the time taken from a record rather than reconstructed from memory?
- Is the place the actual town of birth, spelled as it appears on the document?
- Do you know whether a seasonal clock change was in force at that place and date?
One boundary to keep in view: accurate inputs make a chart correct as a calculation, not a statement of fact about your life. A Kundli is read as symbolic interpretation within a tradition, and no amount of input precision turns it into a prediction or into medical, legal or financial guidance.
Frequently Asked Questions
How precise does my birth time need to be?
Within a few minutes is comfortable for the ascendant and house layout. Beyond roughly half an hour of uncertainty, the ascendant itself may be in question.
Does my birth time need to be converted before I enter it?
No — enter the local clock time as recorded, along with the place and date. The conversion is the software’s job, and doing it yourself is a common source of one-hour errors.
Can a Kundli be calculated from date and place alone?
Partly. Planetary positions by sign and the Moon’s Nakshatra are usually reliable; the ascendant, the house layout and precise Dasha timing are not.
Want to see what your details produce before committing to a full reading? Start with the Janam Kundli explained guide, or try a free basic birth chart analysis.
