Free tool · UK
Sun, Moon and Rising Calculator (UK): Big Three
The big three are the signs of the Sun, the Moon and the Rising sign (Ascendant)ACThe sign on the eastern horizon at the moment you were born. It is the part of the chart that moves fastest, so it depends most on the birth time.Learn more →. Enter your date and place of birth and we'll show all three, and which of them depends on the time you were born. The time is optional.
Narrow it down with your life events
A calculator needs a time. Our report works the other way round: it tests the possible times against the dated events of your life. We aren't taking UK orders yet; leave your email and we'll send one message when we open.
Which of the big three depends on the time?
The rising sign always does: it changes about every 2 hours. The Moon sign does only on dates when the Moon changes sign, which is roughly four dates in ten. The Sun sign does only on the one date a month when the Sun moves into a new sign.
Each card is marked, so you can see where a doubtful birth time could change the result and where it can't.
Born in the UK?
A full birth certificate in England and Wales normally doesn't show the time of birth, except for twins and other multiple births. Scotland is different. Read how to find your birth time in the UK and whether a birth certificate shows the time.
Short answers
- What is the big three in astrology?
- Your Sun sign, your Moon sign and your rising sign (the Ascendant). They are three points of the birth chart.
- Can I find my big three without a birth time?
- You can find your Sun sign, and your Moon sign on most dates. The rising sign needs a time. The free range check lists every rising sign that fits a range of hours.
- Does it allow for British Summer Time?
- The time you enter is read as the clock time at your place of birth in the UK, using the historical time zone rules for that date, including British Summer Time and the other changes to UK clocks over the years. If the clocks went forward and your time falls in the skipped hour, the calculator tells you.
More free tools
- Ascendant calculatorYour rising sign and Midheaven, and how long your sign lasts.
- Moon sign calculatorFind out if your birth time can change your Moon sign.
- Midheaven calculatorYour MC sign and how far it moves in two hours.
- Houses calculatorPlacidus cusps and the planets that change house.
- How to find your rising signThree ways, from a calculator to a range check.
- How to find out what time you were bornWhere to look for your birth time, and what to do if you can't find it.
- Birth chart without a birth timeWhat you can use and what needs the time.
- Free range checkEvery rising sign that fits inside a range of hours.
Want more than a range? See what a full report looks like in the sample report, or get notified when UK orders open.
Astrology is a symbolic practice, not a science. Your report gives the most consistent birth-time window for the events you share. It is not a certified birth time.