Birth Chart Without Birth Time: What You Can Still Know

A birth chart without birth time is far from useless. If you know your date and place of birth but not the hour, you can still read every planet by sign and most of the aspects between them. What you lose are the parts of the chart that depend on the exact minute: the Rising sign, the houses and the Midheaven. This guide explains what you keep, what you lose, and how to track down the time you were born.

Can you make a birth chart without a birth time?

Yes. A chart needs three things: a date, a place and a time. With the time missing you can still calculate where every planet was on your birth date, because planets move slowly compared with the clock. The calculation simply has to pick a time of day, and for most of the chart that choice makes no difference.

This is how our own site works. If you leave the time blank, we read every planet by sign and leave out the Rising sign and the houses entirely, rather than guessing at them. A chart with a guessed time looks complete but is wrong in exactly the places that matter most, so we'd rather give you fewer, correct things.

What you can still know without your birth time

Your Sun, Mercury, Venus, Mars and the slow planets

The Sun changes sign roughly once a month, Mercury and Venus a little faster, and Mars about every six weeks. Jupiter, Saturn, Uranus, Neptune and Pluto stay in a sign for a year or much longer. For almost everybody, the sign of each of these planets is the same whatever the hour of birth.

The exceptions are people born on the day a planet changes sign. If you were born on a day near a sign boundary, the time of day decides which side you fall on. Our guide to zodiac sign dates shows the typical changeover days, and born on the cusp explains what to do if you're one of them.

Your Moon sign, with one caution

The Moon moves fastest: roughly 12 to 15 degrees a day, so it spends only about two and a half days in each sign. On most days it stays in a single sign for the whole 24 hours, and then your Moon sign is certain. On the day the Moon changes sign, the birth time decides, so the Moon could be in either of two signs.

The easiest way to find out is to run your date through the Moon sign calculator. If it tells you the Moon stays in one sign all day, you're fine. If it warns you of a sign change, you have two candidates and you can read both and see which one feels right, or find your time. For what each Moon sign means, see our guide to the Moon sign.

Most of the aspects

Aspects are the angles between planets, such as conjunctions, squares, trines and oppositions. Because the slow planets barely move in a day, almost all aspects between them are the same at any hour. Aspects between faster planets (Mercury, Venus, Mars) and the slow ones also hold with very little error. Only aspects that involve the Moon can shift by up to six or seven degrees across the day, so a Moon aspect near the edge of its orb may or may not be exact. Our guide to aspects explains how orbs work.

The element and modality balance

Because it is built from the signs of the planets, your balance of fire, earth, air and water, and of cardinal, fixed and mutable, is nearly always intact. Our guide to elements and modalities shows how to read it.

The lunar nodes and retrogrades

Your North Node and whether a planet was retrograde on your birth date are also determined by the date, not the hour (for planets that turn retrograde or direct on your birthday, there can be a small uncertainty). See what the North Node means in each sign.

What you lose without a birth time

Three things depend entirely on the exact time and place:

• The Rising sign (Ascendant). The Rising sign is the sign that was on the eastern horizon at birth. It changes roughly every two hours, so the whole zodiac passes over it each day. Without the time it could be any of the twelve signs. See what a Rising sign is.
• The houses. House cusps are tied to the Rising sign, so without it no planet can be placed in a house. This removes the "where in life" part of a reading: whether Venus is about your home, your work or your friendships.
• The Midheaven (career point). This is the highest point of the sky at birth, and it moves around the whole zodiac in a day, as the Rising sign does.

Some smaller points, such as the Part of Fortune and the Vertex, are lost as well, along with any exact aspect to the Rising sign or Midheaven. Together with the Sun and Moon, the Rising sign completes the "Big Three", so if you want to understand that triangle, read our guide to the Sun, Moon and Rising sign.

How to find your birth time

It is worth a little effort, because with the time you get a complete chart. Try, roughly in this order:

1. Ask family. A parent, grandparent, aunt or older sibling may remember the hour, or "just after lunch", "in the middle of the night", or the time of a famous TV programme. Even an approximate memory is helpful for narrowing it down.
2. Look for your birth certificate. In many countries the time of birth is recorded on the certificate or in the register entry. In others only a longer or full version includes it, so it's worth asking the registry for that version.
3. Check baby books and papers. Hospital wristbands, a card from the hospital, a baby diary, a birth announcement or a christening certificate may mention the time.
4. Contact the hospital or records office. Maternity records are often kept for years. Policies vary by country, and some people can request their own birth records. Registry offices, local archives and, in some countries, the civil registration service can also help.
5. Ask whoever was there. If a midwife or doctor is still around, they sometimes remember or still have notes.

If you do find a time, check whether it was written in local time, and whether summer time applied. Our calculators take the local time and handle the conversion for you.

What about birth time rectification?

If no record exists, some astrologers offer rectification: working backwards from major life events (moves, marriages, bereavements, career changes) to estimate the most likely birth time. It's a long-established technique, and some people find it illuminating. It's also an estimate rather than a fact, and different astrologers can arrive at different times from the same life story. If you try it, treat the result as a working hypothesis. Our reports don't rely on it.

Getting a reading without a birth time

If you don't have the time yet, you can still get something useful. The Natal Chart Report works without one: every planet from Mercury to Pluto is read by sign, with the aspects between them and the element and modality balance, while the Rising sign, the houses and the Midheaven are simply left out. If you later find your time, you can order a new report with the full chart, including the Rising sign.