You want your full birth chart, and one thing is missing: the exact time. The good news is that it almost always exists somewhere, written down in black and white. Most of the time you only need to know where to look, and to avoid one very common misreading.

Before the offices and the forms, it helps to know what that time buys you. It keeps you going past the second letter, and it stops you from typing “around 8 a.m.” into a questionnaire and hoping for the best. The rest of this article shows, figures included, everything an “around” takes with it.

The worked examples come from five people who return from one article to the next. Louise, born in Helsinki. Her daughter Carla, born in Lisbon. Her ex Alfred, born in Lyon. Her partner Mateo, born in Montevideo. And her friend Jonas, born in Nairobi. They are invented, and their skies are calculated for real, with the Swiss Ephemeris and Placidus houses, exactly as in the readings I sell.

What the time buys, and what it leaves alone

The Earth turns on itself in twenty-four hours, so the degree of the zodiac rising in the east is always moving. That degree is the Ascendant, and it sets up the twelve houses, the twelve areas of life your planets settle into. The Midheaven, the highest point of the chart, the one you look toward, turns with it. Both move on average one degree every four minutes.

Your planets are in no hurry. Over the whole of 1 January 1990, Louise’s Sun moves one degree and one minute of arc, and her Moon thirteen degrees and twenty-seven minutes. That is why your Sun sign and most of your aspects can be read without a time. What depends on the minute is the Ascendant, the Midheaven, and the house each planet falls in.

For Louise, born at noon, the Ascendant is at 24°31′ Aries. At 11:56 it was at 20°31′. Four degrees in four minutes, where the average promises one. Her Midheaven, over the same four minutes, moves 55 minutes of arc. The Ascendant alone is racing.

For Jonas, born in Nairobi at 7:00 a.m., the Ascendant is at 17°56′ Sagittarius. Four minutes earlier it was at 17°00′: fifty-six minutes of arc, almost exactly the average, while his Midheaven covers 1°05′. In his chart the two points keep the same pace. Nairobi lies one degree from the equator and Helsinki sixty degrees north, and the closer you get to the pole, the faster some signs sweep across the horizon.

Twenty-eight minutes of Aries

Some signs take longer than their neighbours to cross the Ascendant, and the gap widens with latitude. The Midheaven keeps its steady pace wherever you were born. At the equator, each sign holds the Ascendant for about two hours before handing over to the next. For Jonas, that day, none strays more than a quarter of an hour from those two hours.

In Helsinki, the same day, Leo holds the Ascendant for more than three hours. Aries holds it for twenty-eight minutes, from 11:37 to 12:05 and not one more. During those twenty-eight minutes the Midheaven covers six degrees and thirty-six minutes, calmly, as on any other day.

Louise was born at 12:00, in the last minutes of that window. At 12:06 her Ascendant would be in Taurus, at 0°13′. All her houses would turn with it, starting with the first house, the one through which people see her arrive somewhere. Her margin is under six minutes, which is why a time that is only “roughly right” costs so much, for so long.

What half an hour moves

Half an hour is about the size of a family memory: “It was just after eight.” On paper it looks like a small imprecision. On a chart it moves three things at once. The Ascendant can change sign. So can the Midheaven. And a planet can tip from one house into the next, and so from one area of life into another.

Among the five people in this article, half an hour either way is enough to change the sign of the Ascendant for three of them: Louise, Alfred and Mateo. For Jonas and Carla it holds, and only slides by six or seven degrees. What tips over then is the other angle: Carla’s Midheaven moves from Pisces to Aries between 8:30 and 9:00.

For Louise, the Ascendant is in Pisces at 11:30, in Aries at 12:00 and in Taurus at 12:30. One hour of uncertainty gives her three possible Ascendants. Over the same span her Sun leaves the tenth house, the house of career and of what you aim for, for the ninth, the house of far horizons and of what gives life meaning.

For Alfred, born in Lyon at 8:00 a.m., half an hour earlier moves his Moon from the third house to the fourth. The third house speaks of everyday words, siblings and short trips. The fourth speaks of home and of what you carry from your family. The same Moon in Gemini, and two readings with almost nothing in common.

For Carla, born in Lisbon at 9:00 a.m., half an hour earlier pulls her Sun into the twelfth house. Instead of a Sun in the eleventh, turned toward groups and friendships, you read a Sun in retreat, in the most inward sector of the chart. For an eight-year-old, those are two portraits no one would mix up.

Noon or midnight: the question people forget to ask

Family memory rarely gets the day wrong. It regularly gets the half of the day wrong. “It was in the morning.” “We got home in the night.” Between what gets told and what gets written on a record, there can be twelve hours. A chart cast on the wrong half turns over completely.

For Louise, at midnight instead of noon, the Ascendant moves from Aries to Libra, at 3°15′. Her Sun leaves the tenth house, career and aims, for the fourth, home and roots. Her Moon leaves the twelfth house, the most inward of the chart, for the fifth, the house of play and of what you show of yourself. The calculation is still right. The person is unrecognisable.

So when you ask someone in your family, ask for the time of day in the same sentence, before the number itself: morning, afternoon, middle of the night. Three seconds, and half a chart saved.

A French birth record: the time is there, written out in words

On a full copy of a French birth record, the copie intégrale d’acte de naissance, the time is written out in words. It sits on a line that starts with “à :”, just below the “né(e) le” line (born on). For a fictitious birth on 1 January 2000, it reads: “né le premier janvier deux mille, à : douze heures trente-quatre minutes”, meaning born on the first of January two thousand, at twelve hours thirty-four minutes.

The trap to know before you look: the next line also starts with “à”, and that one gives the place of birth. Reading fast, the eye jumps straight to that second line, takes it for the place as usual, and concludes that the time “isn’t given”. It is. There are two “à” lines in a row: the first carries your time, the second your place. It is the most common misreading of this document, and the easiest to fix once you know about it.

✦ Once you have the time, see what it changes in your reading — the adult birth chart · $29.99

Three ways to get it

1. The full copy of the birth record (the safest)

A simple extract, the extrait, may show only the date. The full copy reproduces the whole record, time included. For a birth in France, you request it free of charge from the town hall (mairie) of the place of birth, or online through service-public.fr. You need your date, your place, and your parents’ first and last names. Allow a few days, and an envelope in your letterbox.

2. The family record book

If your parents still have their livret de famille, open it at your page. Some books record the time of birth and others don’t: it takes thirty seconds to check, and it sometimes spares you any paperwork. While it is in your hands, photograph the open page. Copying a number from memory on the train home, quietly convinced you will remember it, is how the time gets lost.

3. The health booklet

It is often the fastest source, and the last one people think of. The first page of the carnet de santé, filled in at the maternity ward, often gives the exact time. If yours is sleeping in a box at your parents’ place, ask for a photo of that first page: you have your answer the same evening, without writing to anyone.

Born abroad to a French parent

If the birth took place outside France but one parent is French, the record is transcribed by the Central Civil Registry Office in Nantes (Service central d’état civil). You reach it through pastel.diplomatie.gouv.fr, or directly through the relevant French consulate. It is free.

Sometimes it is precisely this French document that carries the time, where the record from the country of birth leaves it out. A binational family then finds it faster on the French side than on the local one, so start with Nantes before launching a request abroad.

Belgium, Switzerland, Quebec: same principle, other offices

The principle holds wherever the civil registry records a time of birth: the complete version of the record carries it, never a summary. Wherever you apply, say that you want the version that shows the time. The name of the document changes from one country to the next, and the request is understood everywhere.

If you really can’t find it

It happens. An incomplete record, lost papers, a home birth nobody timed. A reading is still possible, as long as it is honest about what is missing. Without a time there is no Ascendant, no Midheaven and no exact houses, so nothing of what the sections above have just measured degree by degree. Your Sun, your planets in signs and a good share of your aspects read normally.

One thing needs an extra check: the Moon. It moves thirteen degrees a day, so it changes sign every two days and a bit. If that change falls on your date, without a time it cannot be settled. The Sun takes a month to cross a sign and never raises the problem. For three of the five people in this article, the Moon changes sign during the day of birth: Louise, Alfred and Mateo. For Carla and Jonas, the Moon stays in the same sign from the first instant of the day to the last.

Louise is the textbook case. On 1 January 1990 her Moon leaves Aquarius for Pisces at 8:10 a.m., Helsinki time. Born at noon, she has a Moon in Pisces at 2°09′, in the twelfth house. Born at 7 a.m., she would have a Moon in Aquarius: a need for distance and air, where Pisces brings a porousness to every atmosphere. Without her time, nobody can choose between the two.

The usual fallback, when the time is missing, is to cast the chart for noon. It is the least bad choice, and it helps to know what it costs. For Carla, the noon chart gives a Leo Ascendant at 24°26′, and her real time gives a Cancer Ascendant at 18°12′. Her Sun ends up in the tenth house instead of the eleventh, her Moon in the fifth instead of the sixth. A noon chart is read by its signs, with your eyes shut to its houses.

You can test all this yourself: the free calculator draws your chart live, in your browser. Enter your assumed time, then the same time half an hour either way, and watch what moves.

✦ Go further than a calculation: a reading written for you — the adult birth chart · $29.99

Frequently asked questions

Is a birth record extract enough?

Not always. In France, a simple extract may show only the date. The full copy is the only version that guarantees the time is there: that is the one to ask for, and it is free.

What if I can’t get hold of any of these documents?

Ask your parents, or whoever was there when you were born. A family memory, even a rough one, is better than nothing: at the very least it gives the half of the day, and that alone separates the noon chart from the midnight chart. Ask too what was going on around the birth: the meal, the night shift, the time of the phone call. Concrete landmarks date a birth better than a number you think you remember.

Does a time rounded to the half hour work?

For your planets in signs, yes, easily. For the Ascendant and the houses, it depends on the sign that was rising and on your latitude. For three of the five people in this article, half an hour changes the sign of the Ascendant, and for Louise it changes twice within the same hour. A reading done on a rounded time is still useful, as long as it says what it holds as uncertain.

Does every birth record have to show the time?

In France, yes, and it has for a long time. Some very old records, or records drawn up in unusual circumstances, are exceptions: in that case the health booklet or the family’s account takes over.

Can the free calculator tell me my birth time?

No. No tool can guess a time that was never recorded. What it does is show you what changes in your chart depending on whether you know it: the Ascendant, the Midheaven, the house of each planet. You see what is at stake with your own eyes, before you start the paperwork.