Unknown birth time
Don’t know your birth time?
Most placements can still be found from the date alone. When one can’t, the calculators show every possibility and the exact time that separates them, instead of guessing.
What the calculators do
Tick “I don’t know my birth time” and the calculator works out the whole day at your birth place, from 00:00 to 23:59. If the planet stayed in one sign, you get that sign with the range of degrees it covered. If it changed sign, you get both signs and the local time of the change.
For example, on 6 May 1995 in Chicago the Moon entered Leo at 07:54. Someone born that day without a known time sees “Moon in Cancer or Leo”: Cancer from 26°00′ if born before 07:54, Leo up to 8°11′ if born after.
With no birth place either, the window widens to cover your date in every time zone, and the change times are given in UTC.
How often the birth time matters
Share of dates from 1940 to 2035 on which each body changed sign, worked out with the same engine as the calculators:
| Body | Dates with a sign change | About 1 date in |
|---|---|---|
| Moon | 44% | 2 |
| Sun | 3.3% | 30 |
| Mercury | 4.1% | 25 |
| Venus | 3.5% | 29 |
| Mars | 1.9% | 53 |
Slower bodies (Saturn, the north node, Lilith) change sign a handful of times a decade. The rising sign and midheaven are different: they pass through every sign each day, so they cannot be found without a birth time.
Where to find your birth time
- The long-form birth certificate. In many places the short form leaves the time out, but the full record has it.
- The hospital or birth records office where you were born.
- A baby book, birth announcement or family letter written at the time.
- A parent or relative who was there. Ask whether the time is exact or remembered roughly.
Even a rough window helps: if you know you were born in the evening, and the change happened in the morning, you have your answer.
Moon sign calculatorSun, moon and rising calculatorFull method