Moon sign and rising sign calculator: your Big Three in one go

Your Sun sign is easy to find because it follows your birthday. Your moon sign and rising sign are not. The Moon changes sign every couple of days and the rising sign changes roughly every two hours, so you need your birth time and birthplace as well as the date. That is the whole reason people go looking for a moon sign calculator or a rising sign calculator.

The tool above is a sun moon rising sign calculator, so it does all three at once. Give it a date, time and place and it returns your Sun, Moon and rising sign (what astrologers call the Big Three, or Big 3), the exact degree of each, a zodiac wheel and a short reading. It is a free astrology calculator, there is no account to make, and it works for any birth date from 1900 onwards.

This guide shows you how to use it properly, how to read every part of the result, what to do if you cannot find your birth time, and how the maths works underneath. If you only want the quick version, read the first section and you are done.

How to use this moon and rising sign calculator

The calculator asks for three things: when you were born, what time, and where. Everything is worked out on the page itself, so there is nothing to install.

Before you start

• Your date of birth.
• Your time of birth, as the clock on the wall showed it. If you do not have it yet, the section on birth times further down tells you where to look.
• The town where you were born. If you were born in a hospital in the next town along, use the hospital’s town, not the family home.

1. Pick your date of birth. Choose the day, month and year from the three drop-downs. The year list starts at the current year and runs back to 1900. Impossible dates such as 31 June are caught straight away, and a birth date in the future is refused.
2. Add your time of birth. Choose the hour and minute. Hours are shown as am or pm, so 12 am is midnight and 12 pm is midday. Enter the time exactly as the clock read at your birthplace, summer time included. Please do not convert it to GMT yourself; the calculator does that for you. If you genuinely do not know the time, press Not known and the hour and minute boxes switch off.
3. Search for your place of birth. Type two or more letters of the town. Suggestions appear under the box: a built-in list of major cities shows up instantly, and an online place search adds smaller towns a moment later. Click one, or use the arrow keys and Enter, and a gold tick confirms your choice. The place matters twice over. Its latitude and longitude decide your rising sign, and its time zone tells the calculator what the clocks said on your birthday.
4. Only if you need it: use coordinates. If your town does not appear, tap Use coordinates above the search box. Type the latitude and longitude as decimals (north and east are positive, south and west are negative, so Manchester is about 53.48 and −2.24), then choose the UTC offset that applied on the day you were born. UK winter time is UTC+0 and UK summer time is UTC+1. Tap Search places to switch back.
5. Press Find my Big Three. A short animation plays while the calculator works, then the result opens and the page scrolls so the tool sits at the top of your screen. Reset clears every box if you want to start again.

How to read your result

Here is what each part of the result screen is telling you, using a real example: someone born in Leeds at 4:20 pm on 19 August 2005.

• The headline. “Leo Sun, Aquarius Moon, Sagittarius rising”, with your birth details underneath. The small Moon in the top corner shows the Moon’s phase at your birth, here a Full Moon. Tap it to jump to the Moon reading.
• The zodiac wheel. The outer ring holds the twelve signs, coloured by element: orange-red for fire, green for earth, yellow for air and blue for water. The signs that hold your Big Three are brighter than the rest. The gold dot is the Sun, the pale dot is the Moon, and the arrow on the left marks the Ascendant, the eastern horizon at the moment you were born. The dashed line labelled MC is the Midheaven, the top of the chart. The key at the bottom counts how many of your Big Three fall in each element.
• The three cards. Sun, Moon and Rising each show the sign and the degree inside it, for example 26°44′ Leo. The degree counts up when the result appears. Tap a card, or tap the matching dot on the wheel, to open its reading.
• The reading panel. Under the cards you get the sign’s element, its mode (cardinal, fixed or mutable), its ruling planet and a short description. Below that is a line of timing detail: how long the Sun or Moon stayed in the sign, or the clock window when your rising sign was on the horizon.
• The buttons. Edit takes you back to the form with your answers still filled in, which is handy for trying a different birth time. Copy puts a short text summary on your clipboard (on a phone it becomes Share). New clears everything.

The rising-sign window is the most useful line on the page. If your birth time is only approximate, check whether your best guess falls inside it. If it does, your rising sign is the same whichever exact minute turns out to be right. In the example above, anyone born in Leeds between 3:05 pm and 5:39 pm that day has a Sagittarius ascendant.

Messages you might see

No birth time? You still get a result

Press Not known and you still get a Sun sign and, most of the time, a Moon sign. The Moon changes sign during a birth date on about 44% of days, so on the other 56% one sign covers the whole day and the calculator tells you the answer is safe without a time. When the Moon did change, you see both signs side by side. Someone born in Birmingham on 12 June 1994, for example, gets “Gemini Sun, Cancer or Leo Moon”, with a note that the Moon moved into Leo at 17:28. The rising sign is the one thing a date alone cannot give you, and the calculator says so rather than guessing.

What are the Big Three in astrology?

Astrologers read three placements first. The Sun sign describes your core identity and what drives you. The Moon sign covers your emotional side: what comforts you, how you react when you are stressed and what you need to feel safe. The rising sign, also called the ascendant, is the front door: the way you come across when you meet someone new.

Together the three are the headline of your natal chart, also called your birth chart. Plenty of people feel their Sun sign only tells half the story. That is usually where the other two come in. Two people born in the same month share a Sun sign, yet their Moon signs can sit several signs apart.

Share of calendar days on which each sign changed at some point during the day. Worked out with this calculator’s own engine for all 13,149 days from 1990 to 2025, using London clock time. The rising sign changes about twelve times a day, so it is always 100%.

That chart is the argument for entering a birth time. The Sun almost never changes sign on your birthday, the Moon does so about four times in ten, and the rising sign changes so often that a few hours either way gives you a different answer.

What is my moon sign?

Your moon sign is the zodiac sign the Moon was passing through when you were born. The Moon is the quickest mover among the bodies astrologers use. It goes right round the zodiac in about 27 days, so it spends only two to two and a half days in each sign. We timed 3,207 sign changes between 2000 and 2020: the shortest stay was 47 hours, the longest 61, and the average just under 55.

This is why a moon sign calculator by date of birth and time needs to be exact. A chart that works from the date alone can only be sure when the Moon stayed in one sign all day, which is a little over half of all dates. For the rest, you need the time, and the calculator shows you the moment the Moon switched so you can see which side of it you fall on.

Why is my moon sign different from my sun sign?

They run on different clocks. The Sun takes a year to travel round the zodiac and the Moon takes about a month, so the two only share a sign for a couple of days around each New Moon. If your Sun and Moon signs match, you were most likely born within a couple of days of a New Moon, and the phase badge on your result will agree. For everyone else, different Sun and Moon signs are completely normal.

Moon sign meanings at a glance

These are one-line summaries. Your own result includes a longer reading, plus the element, mode and ruling planet.

What is my rising sign (ascendant)?

Picture a line running due east from where you were born, at the moment you arrived. The zodiac sign sitting on that horizon is your rising sign, or ascendant sign. The two words mean the same thing, so an ascendant calculator and a rising sign calculator give you the same answer. Any rising sign calculator by date of birth and time needs all three details, and here is why: the date and place fix the sky, but only the time tells you which part of it was on the horizon.

That is also the answer to how to find your rising sign: you cannot do it from the date alone. The Earth turns through 15 degrees every hour, so the whole zodiac crosses the horizon once a day. On average each sign takes about two hours. “On average” matters, because the signs are not equal.

Time each sign takes to cross the eastern horizon at 51.5° N (h = hours). The pattern is the same all year round.

In London, Pisces and Aries are over in 52 minutes, while Leo, Virgo, Libra and Scorpio each last close to three hours. Astrologers call these signs of short and long ascension. It happens because the zodiac is tilted against the horizon, and the tilt matters more the further you are from the equator.

So the further north you were born, the more a few minutes can matter for a short sign, and the less they matter for a long one.

Same date, same clock time, different town

Latitude and longitude both feed into the rising sign, so two people born at the same clock time in the same country can have different ascendants. Take 7:30 am on 15 March 2000:

Belfast, Swansea and Cardiff sit on the Aries side of the boundary and the other three on the Taurus side. That is why the calculator asks for your town rather than just your country.

Rising sign meanings at a glance

Sun sign dates for 2026 (UK time)

Sun sign dates printed in magazines are rounded, because the Sun does not change sign at the same moment every year. The exact time moves about six hours later each year, then jumps roughly eighteen hours earlier in a leap year. These are the 2026 moments in UK time (GMT or BST, whichever applied), worked out with the same engine as the calculator and rounded to the nearest minute.

Born on 22 July 2026? Before 20:13 BST you are a Cancer, after it a Leo. A birthday-only chart cannot show you that; the calculator reports it as a cusp birth. If you want to count the days until the Sun moves into your sign, our date calculator will do the sum.

How the calculator works, and how we checked it

First, time. Your local birth time is turned into universal time using the time-zone database built into your browser. That database remembers old clock changes. The UK ran on British Standard Time from February 1968 to October 1971, with the clocks an hour ahead of GMT all year, and during the Second World War the summer clocks ran two hours ahead. We tested both: 15 January 1970 comes out as UTC+1 and 15 July 1944 as UTC+2.

Second, the Sun and Moon. The Sun’s position comes from the VSOP87 planetary tables, corrected for the wobble of the Earth’s axis and for the finite speed of light. The Moon comes from the full table of periodic terms in Astronomical Algorithms, the standard reference by the Belgian astronomer Jean Meeus. Both allow for the slow drift between clock time and the Earth’s real rotation, known as Delta T.

Third, the ascendant. It comes from sidereal time (the Earth’s rotation measured against the stars), your latitude and the tilt of the Earth’s axis: the same spherical trigonometry that surveyors and navigators have used for centuries, just aimed at the sky instead of the ground.

Fourth, the edges. Every 30 degrees of the ecliptic is one sign, counted from the March equinox. To find when you entered or left a sign, the calculator steps through time and then narrows down on the exact second. That is where the “in Leo from… to…” lines come from.

How we checked it

Diana, Princess of Wales, born 1 July 1961 at 7:45 pm near Sandringham, using published chart data.

The Sun’s sign changes line up with the published equinox and solstice times to the minute, and the worked examples in the astronomy textbook agree to a tiny fraction of a degree. For a real chart, the Sun and Moon matched exactly, and the ascendant came out within one minute of arc, which is a sixtieth of a degree and the sort of gap you get from rounding. Every one of these checks is public record, so you can repeat them yourself.

Tropical or sidereal?

This calculator uses the tropical zodiac, which is the one used in Western astrology, where 0° Aries is the point of the March equinox. Vedic astrology uses the sidereal zodiac, which sits about 24 degrees behind. A Vedic moon sign is therefore most often the sign before the one you see here, so do not be surprised if the two systems disagree. Neither is a measurement error; they start counting from different places.

What accuracy can and cannot mean

The astronomy is exact to a fraction of a degree. What it cannot do is fix a birth time that was written down wrongly. On average the ascendant moves about one degree every four minutes, so a guess that is fifteen minutes out can shift your rising degree by around four. That is why the calculator shows you the window and warns you about close calls instead of pretending to be sure.

On privacy: the calculation runs in your browser, and your birth date and time are not sent anywhere. The only thing that goes online is the place name you type, so a place-search service can suggest towns.

Finding your birth time, and when the clocks get in the way

The best source is a record written at the time. In Scotland the birth certificate usually shows the time of birth. In England and Wales the standard certificate usually does not, except for twins and other multiple births, so look at hospital records, the notes your parents kept, or the Personal Child Health Record (the “red book” many UK parents were given), which often has it filled in.

A time remembered by a relative is better than nothing, but people round. “About three o’clock” can easily be ten to three or twenty past. Run the calculator with your earliest and latest guess and compare the rising windows it shows. If both land in the same window, you can stop worrying.

Enter whatever time you have as the clock showed it at the birthplace. If a relative abroad only remembers the time in their own time zone, convert it to local birthplace time first, then type that in.

Clock changes catch people out too. When the UK clocks go forward in March, one hour disappears, so a birth time of 01:30 on that night cannot be right. When they go back in October, an hour happens twice. The calculator spots both and tells you what it assumed, so you can check the paperwork.

Moon sign compatibility

People often look for a moon sign compatibility calculator once they have found their own. You can get a useful first impression without one. Run both birth dates through the tool above, note the element on each Moon card, then look the pair up here.

The old rule of thumb is that fire and air feed each other, earth and water settle each other, and the other pairings take more work. Easy means you probably handle feelings in a similar way. Tense means you may need to explain yourselves more often. It is a starting point only. Plenty of couples who clash on paper get on well, and the reverse is just as common.

Mistakes that give the wrong answer

• Converting to GMT yourself. Enter the time as the clock showed it. The calculator does the conversion, so doing it twice shifts everything.
• Mixing up 12 am and 12 pm. 12 am is midnight and 12 pm is midday.
• Using where you live now. The place must be where you were born, not where you grew up.
• Trusting an approximate time. Check whether it sits inside the rising window. If it does not, find a better source.
• Reading a date the wrong way round. 03/04/1990 is 3 April in the UK and 4 March in the US. The calculator uses month names, so there is no mix-up.

Frequently asked questions

Tap a question to see the answer.

A note on astrology

Astrology is a tradition people use for reflection and fun, and there is no scientific evidence that star signs predict personality or events. Treat your Big Three as a conversation starter, not a forecast, and please do not base health, money or legal decisions on it. What the calculator does give you is a precise answer to a factual question: where the Sun, Moon and horizon were when you were born.

If the sky is your thing, our Pluto time calculator shows your local Pluto time.

Add this tool to your website

You are welcome to use the Moon and Rising Sign Calculator on your own site for free. Copy the code below and paste it into the HTML of any page that accepts an embed, such as Blogger, WordPress or most site builders. Change the height value if you want a taller or shorter frame.