Find your rising sign without a birth time
Do not know what time you were born? Enter your birth date, your birth town and the dates of a few big life events. This free birth time rectification calculator tests every four minutes of your birth day against those events, the way astrologers have long checked an uncertain birth time, and ranks your likely rising signs.
First, look for a record. A written time beats any calculation. In many US states the long-form birth certificate lists the time of birth, and hospital records, a baby book or a relative who was there can help too. If none of those turn anything up, this tool gives you candidates to work with. Where to look
How the birth time finder works
- Every four minutes of your birth day. The sky turns once a day, so the rising sign changes on average every two hours and the rising degree moves about one degree every four minutes. The finder tests a birth time every four minutes from midnight to midnight in your birth town. If you give a rough window, it takes its candidates from inside it, and still measures them against the whole day. Clock times follow the time zone rules on record for your town's zone on your birth date, daylight saving time included. Before 1967 some smaller US towns kept their own daylight saving time, so if you were born in one, the clock times here could be an hour off from the town's own clocks.
- Transits to the angles. For each tested time it works out the four angles of the chart: the Ascendant (the rising degree), the Descendant opposite it, the Midheaven at the top and the IC at the base. Then it checks where Jupiter, Saturn, Uranus, Neptune and Pluto stood on each of your event dates. Astrologers read a slow planet crossing an angle as a time when life changes shape. A crossing within two degrees counts, and a square within one and a half degrees counts for half. For an accident or surgery with an exact date, Mars counts too.
- Solar arc directions. It also uses solar arcs, a timing method many modern astrologers rely on for rectification. Every planet and angle is moved forward by the distance the progressed Sun has traveled since your birth, close to one degree a year. When a moved angle reaches a birth planet, or a moved planet reaches a birth angle, within one degree, it counts. One degree is about a year of life, so this part needs the right year.
- Each event leans on its angle. Tradition ties kinds of events to the angles: home, family and parents to the IC and Midheaven; partners to the Ascendant and Descendant; work and standing to the Midheaven; the body, accidents and surgery to the Ascendant. Each event counts most where tradition puts it, and most for the planets tradition links with it: Saturn with loss and duty, Jupiter with growth and honors, Uranus with sudden change. Tradition gives children to the fifth house; this tool keeps to the angles and reads them on the Ascendant and Descendant. Where tradition is loose, as with children, the death of someone outside the family or an "other" turning point, the weights are this tool's own choice, shown in the table below.
- Ranked by rising sign. The scores are smoothed over about twelve minutes either side, because rectification cannot honestly pin the minute, and grouped by rising sign. You get the two or three signs whose best stretch fits your events most, each with its clock times and the contacts behind it, and a plain word for how much it stands out from the rest of your birth day.
Which events to use
- Exact dates where you can. A month and year still count, with less weight: Jupiter can move several degrees in a month, and the outer planets a degree or so.
- Outward changes you can date: moves, marriages, separations, the birth of a child, a new job or a lost one, an accident or surgery, the death of a parent.
- Spread over the years. Events from different decades test different parts of the chart.
- Your own life. Someone else's news counts only where it changed yours.
| Event | Angles this tool weighs most | Planets it weighs most |
|---|---|---|
| Moved home | IC, then the Midheaven | Uranus, Moon, Saturn |
| Married or moved in together | Ascendant and Descendant | Venus, Jupiter |
| Separated or divorced | Ascendant and Descendant | Saturn, Uranus, Pluto |
| A child was born | Ascendant and Descendant | Jupiter, Moon |
| Started a career or big new job | Midheaven, then the IC | Sun, Saturn, Jupiter |
| Promotion or public recognition | Midheaven | Jupiter, Sun |
| Lost a job or business | Midheaven, then the IC | Saturn, Uranus, Pluto |
| Death of a parent | Midheaven and IC | Saturn, Pluto, Sun, Moon |
| Death of someone close (other) | All four angles alike | Saturn, Pluto, Neptune |
| Serious accident or surgery | Ascendant, then the Descendant | Mars, Uranus |
| Other turning point | All four angles alike | Uranus, Pluto, Saturn |
What this can and cannot tell you
Rectification is an old technique that astrologers still use. It gives candidates, not a certificate. Two astrologers working from the same events can settle on different times, because they weigh events and methods differently.
It is only as good as your dates. A wrong year moves a solar arc a whole degree, and a month-only date blurs every transit. With this many contact points, any time of day lines up with some of your events, so the words strong, moderate and weak describe how far the best stretch stands above the rest of your birth day, not how likely it is to be right. In our own tests, event dates picked at random still came out moderate or strong about one time in ten on average, and closer to one time in six with only three events, so a result built on more events means more.
Rectification also works inside astrology's own rules, and those rules have not held up in controlled scientific tests. Treat any answer here as a tradition's best guess, not a fact about you.
Where to find your real birth time
- The long-form birth certificate. In many US states the long form lists the time of birth, while the short form often does not. The vital records office of the state where you were born can tell you how to order it. In Scotland the time of birth is part of every birth registration; in England and Wales it is usually recorded only for twins and other multiple births.
- Hospital records. The hospital where you were born, or the office that keeps its old records, may still hold the delivery record.
- Family papers. A baby book, a birth announcement, a hospital bracelet or a letter written that week.
- The people who were there. Ask a parent, an older sibling or a relative. Ask what was happening: a meal, a TV show, the drive to the hospital. Details like that often pin down a time.
Want a person to look?
Rectification is a craft, and an astrologer can weigh your events in ways a calculator cannot. If you would like that, you can ask one. Drawing a chart for any time you are considering is free.
Ask an astrologer about your birth time Free: draw a birth chart
Questions people ask
Can I find my rising sign without a birth time?
Not for certain. Your rising sign changes about every two hours, so without a time any of the twelve signs is possible. What you can do is narrow it down. This tool uses rectification, an old method that tests possible birth times against the dates of big events in your life, and ranks the rising signs that fit them best. The surest answer is still a written record of your birth time.
What is birth time rectification?
Rectification means correcting or finding a birth time from the life it produced. Ptolemy, writing in the second century, described a way to correct the rising degree, and William Lilly's Christian Astrology (1647) treats rectifying a chart by its accidents, meaning the known events of a life. Modern astrologers mostly use transits and solar arc directions to the four angles of the chart, which is what this tool does.
How accurate is a rectified birth time?
It gives candidates, not a certificate. When the events are dated exactly and are the outward kind astrologers look for, the method often points one way. When dates are rough, or the events are inner changes, it often cannot choose. Different astrologers weigh events differently and can reach different times from the same list. And rectification works inside astrology's own rules, which have not held up in controlled scientific tests, so read any answer as a tradition's best guess.
Which life events work best?
Outward events you can date exactly: moving home, marrying or moving in together, separating, a child's birth, starting or losing a job, a promotion, a serious accident or surgery, and the death of a parent. Events spread over different decades test different parts of the chart. A month and year still count, with less weight.
Will my Sun sign or Moon sign change?
Your Sun sign stays the same unless the Sun changed sign on your birth date, and the same goes for every planet's sign from Mercury to Pluto. The Moon moves about 13 degrees a day, so it changes sign roughly every two and a half days; if it did so on your birth date, the result page says so. What the time decides is your rising sign, your Midheaven, which house each planet falls in, and the Moon's exact degree.
Is anything I enter saved?
No. Your birth date, town and events are used once to work out the page you see and are not saved, logged or put in a link by this tool. If you then press a free birth chart button, your birth date, that time and your town go to the birth chart page in its web address, the same as using that tool directly. The site keeps a count of how often the finder is used from your network in an hour, to stop abuse, and a daily tally of which rising sign came out on top, with nothing else attached.
How can I find my real birth time?
Look for a record first. In many US states the long-form birth certificate lists the time of birth, while the short form often does not; the vital records office of the state where you were born can tell you how to order it. Hospital records, a baby book, a birth announcement or a relative who was there can help too.