Moon Phase Compatibility
Calculator
Enter two birth dates. The calculator finds the Moon phase each of you was born under and reads how those two rhythms get on.
How moon phase compatibility works
Everyone is born under one of the eight lunar phases, from the dark New Moon through the Full Moon and back to dark. The phase is one number, the angle between the Sun and the Moon at your birth, and astrologers read it as your default rhythm: whether you start things, build them, finish them, or take them apart. If you have never checked yours, the birth moon phase calculator gives you the phase and the Moon sign from a single date.
The calculator takes the two birth phases and looks at the relationship between them around the cycle. Neighbouring phases, 45 degrees apart, share a direction and move with easy momentum. Phases a quarter-cycle apart form a square; astrologers say they grind, and that the grinding is where both people grow. Opposite phases, New and Full for instance, pull at each other, attraction and challenge in the same package. Two people born under the same phase understand each other on sight and share the same blind spot, with nobody to supply the missing angle.
The “moon phase soulmate test,” and what it measures
You have probably seen the TikTok version, usually called the moon phase soulmate test: each of you looks up the Moon on your birthday, the two pictures are overlaid, and if the lit halves make one full circle the caption says soulmates. It makes a lovely video. Overlapping two moon pictures is a photo edit, though, and the merged image measures nothing about the two of you. It does tell you one thing by accident: two Moons that complete a circle were 180 degrees apart, which is simply the opposite-phase pairing.
This calculator does the version with maths under it. Rather than blending images, it computes each person's birth phase from the ephemeris and scores the relationship between those two phases: where they sit in the cycle, and what astrologers say that means for two temperaments sharing a fridge. The discs you see above are drawn to each person's true illumination on their birthday, so the picture is accurate rather than decorative. Same romance as the trend. Real arithmetic underneath.
What your compatibility score means
I show the result as five moons rather than a percentage, because a percentage reads as a verdict and this is not one. A high score means two rhythms that move together without much translation. A low score marks the places where your instincts differ and a bit of patience is needed; nobody should read it as a warning. Some of the longest partnerships sit at that end of the scale, because each person keeps stretching the other.
Read the pairing text next to the moons. It says what each of you brings, where you click, and the one habit worth watching. Take a smooth match as encouragement and a spikier one as a map of where to be generous, never as permission or a veto on who to love. The Moon phase is one lens. Your Sun signs, your rising signs, and the ordinary work of talking to each other matter at least as much.
Every pairing on one moon phase compatibility chart
All sixty-four combinations of the eight birth phases, scored from 1 to 10. Order never matters, a New Moon with a Full Moon reads the same as a Full Moon with a New Moon, so the chart mirrors itself across the diagonal. Find your phase in the left column, run across to your partner's, and select the score to jump to that pairing's full reading below.
| Your phase | New Moon | Waxing Crescent | First Quarter | Waxing Gibbous | Full Moon | Waning Gibbous | Last Quarter | Waning Crescent |
|---|---|---|---|---|---|---|---|---|
| New Moon | 7 | 9 | 4 | 5 | 7 | 6 | 4 | 9 |
| Waxing Crescent | 9 | 8 | 8 | 5 | 5 | 6 | 6 | 4 |
| First Quarter | 4 | 8 | 5 | 8 | 2 | 5 | 5 | 4 |
| Waxing Gibbous | 5 | 5 | 8 | 6 | 9 | 5 | 5 | 6 |
| Full Moon | 7 | 5 | 2 | 9 | 6 | 9 | 3 | 6 |
| Waning Gibbous | 6 | 6 | 5 | 5 | 9 | 8 | 8 | 5 |
| Last Quarter | 4 | 6 | 5 | 5 | 3 | 8 | 5 | 8 |
| Waning Crescent | 9 | 4 | 4 | 6 | 6 | 5 | 8 | 6 |
- Effortless (9–10)
- Easy (7–8)
- Balanced (5–6)
- Friction (3–4)
- Intense (1–2)
A low number means a pairing that asks for more translation between two different rhythms, and some of the strongest relationships live exactly there. None of these numbers is a verdict.
All 36 moon phase pairings, read in full
Every distinct pairing of the eight birth phases, with the same reading the calculator gives: what each of you brings, where you click, and the one habit worth watching. Each pairing appears once, filed under whichever of its two phases comes first in the cycle, so use the chart above to jump to yours. To find out which phases the two of you are, enter your birth dates in the calculator at the top.
New Moon pairings
New Moon + New Moon (same phase) 7/10 · Easy
Both of you want to start something tonight
Two New Moons meet and something gets started within the hour. A trip, a business, a fight, a second dinner. The recognition is immediate because you both live in the present tense and leap first, and the understanding underneath is deeper than shared adrenaline. What neither of you brought is the middle. Around week three of anything, when the novelty has gone and the thing needs patience and perspective, the two of you are already eyeing the next beginning. Put reflection in the calendar on purpose, and the starts you are so good at might become finishes.
New Moon + Waxing Crescent 9/10 · Effortless
One of you lights it, the other keeps it lit
The New Moon says, on a Tuesday, we should grow tomatoes. By Saturday the Waxing Crescent has bought the canes and drawn a plan of the balcony. That is the whole pairing. One of you produces the impulse and the other the follow-through, and because the two phases sit next to each other in the cycle, 45 degrees apart, neither has to explain the forward pull. It does not read as competitive. It reads as a handover. Raw impulse turned into something with stakes in the ground, with less effort than most couples spend choosing a restaurant.
New Moon + First Quarter 4/10 · Friction
Both in a hurry, in different directions
Neither of you is slow, which is the problem. The New Moon moves on instinct and turns when the instinct turns. The First Quarter decides, then pushes through whatever is in the way, and from that seat the New Moon looks unfocused, while from the New Moon's seat the First Quarter is someone shouldering a gate that was never locked. Ninety degrees apart, which astrologers call a square. It is good for getting unstuck. When one of you has stalled, the other has the energy that was missing, once you stop reading the difference as a verdict.
New Moon + Waxing Gibbous 5/10 · Balanced
The one who starts it and the one who finishes it properly
Picture a kitchen. The New Moon has begun three dishes and wandered off to put music on. The Waxing Gibbous is at the stove, adjusting the salt for the fourth time, quietly appalled. Nobody is wrong. One of you starts freely and moves on, the other gets it right, and each finds the other's habit insulting: rushed on one side, nitpicked on the other. It is a 135 degree angle, awkward rather than hostile. What works is a translation service. Your starts gain polish, their careful work gets some air in it, and nobody grades anybody.
New Moon + Full Moon 7/10 · Easy
Opposite ends of the sky, and it shows
An opposition: Sun and Moon 180 degrees apart at one birth, together at the other, and the pull between you is the magnetic kind. The New Moon jumps. The Full Moon sees the whole situation first, and learns who they are from the people in it, including you. Each finds the other faintly astonishing: how do you just go, how do you not go. The same difference is the strain. Spontaneity unsettles someone who needs perspective before moving, and perspective is a hand on the brake to someone already moving. Handled on purpose, you finish something in each other.
New Moon + Waning Gibbous 6/10 · Balanced
Beginner's luck meets someone who has read the manual
Lopsided, and that is fine. The New Moon comes in on fresh instinct. The Waning Gibbous has been round the cycle, thought about it, and wants to tell you. You are 135 degrees apart, which astrologers file as awkward, and on a slow evening it can sound like a lecture answered by a shrug. Yet each finds the other's angle useful more often than you admit. The teaching partner sees the thing before anybody had opinions about it, and the beginning partner gets a shortcut. Trade. No instructing, no waving instruction away.
New Moon + Last Quarter 4/10 · Friction
New boxes arriving, old boxes leaving
A square, 90 degrees, between the first phase of the cycle and the one that clears out the old. The New Moon is starting something on the afternoon the Last Quarter is questioning whether anything like it should have been started at all. You are out of sync, and you know it. The friction earns its keep two ways. The Last Quarter can spot which of your habits would slow the new thing down, and does not mind saying so. And the New Moon reminds someone in the business of endings that beginning again is still worth doing.
New Moon + Waning Crescent 9/10 · Effortless
Either side of the dark, and easy about it
The cycle wraps around here. The Waning Crescent is the last light before the dark and the New Moon the first after it, 45 degrees apart with nothing between, and people describe something that surprises their friends: it is gentle. One of you is all beginnings, the other has the grace of a good ending, and instead of arguing you take turns. Rest, then renewal. A quiet evening, then a plan. The understanding is unspoken, less a conversation than a baton passed in a relay only the two of you are running. Easy, and not shallow.
Waxing Crescent pairings
Waxing Crescent + Waxing Crescent (same phase) 8/10 · Easy
Two climbers who get nervous in the same week
Same phase, same climb. Two Waxing Crescents recognise the striving in each other, deeply and without explanation, because both are reaching for something larger with one hand on the familiar. Good company on a hard stretch. The catch is timing: you get nervous about the same things in the same week, so nobody is the steady one, and when both are pushing there is nobody to say sit down. This pairing is good at cheering. Celebrate each other's growth loudly, and when one of you clings to the safe option out of fear, say so, kindly.
Waxing Crescent + First Quarter 8/10 · Easy
The planning half and the doing half
Forty-five degrees apart on the waxing side, so both of you are pointed the same way. The Waxing Crescent collects: the quotes and the nerve. The First Quarter spends it, meaning acts, before the collecting felt finished. A team with a job to do. One prepares the ground, the other goes through the obstacle rather than around it, and because your tempos are close you rarely have to wait for each other. The useful adjustment is small. Let the Crescent's caution slow the Quarter's charge by about a day. Bold still, with the receipts kept.
Waxing Crescent + Waxing Gibbous 5/10 · Balanced
Bottom of the hill and nearly at the top
Both on the way up, which sounds compatible until you notice the gap. The Waxing Crescent is still gathering courage at the bottom; the Waxing Gibbous can see the summit and is annoyed about the route. Ninety degrees apart, a square, and the tension is quiet: a raised eyebrow when one of you is not ready and the other is not patient. It becomes an asset when you treat it as an assembly line. Early drive goes in one end, careful refinement comes out the other, and it only runs if you keep translating for each other.
Waxing Crescent + Full Moon 5/10 · Balanced
Forward motion meets someone who wants to talk about it first
The Waxing Crescent wants to get on with it. The Full Moon wants to know how everyone feels about getting on with it, and means it. That is the 135 degree angle, and it takes conscious effort because your needs arrive at different moments: momentum at nine, reflection at half past. Each of you has the other's missing piece. The Full Moon sees the whole field, which the climber does not stop to do. The Crescent supplies a direction, which a Full Moon left alone can circle for weeks. Value the supply. Cheaper than manufacturing it yourself.
Waxing Crescent + Waning Gibbous 6/10 · Balanced
An apprentice and a willing mentor
An opposition, 180 degrees, with the pull oppositions have. On one side, someone striving upward and hungry for anything that helps. On the other, someone who has been up and back and wants to tell you about it. Student and mentor is the shape, and the attraction is real, because what one wants to receive is what the other wants to give. The trouble is delivery. Guidance, given nightly, feels like pressure. Striving, watched nightly, looks like not listening. It works when lessons are asked for and effort is noticed, and both of you get better at it.
Waxing Crescent + Last Quarter 6/10 · Balanced
An ambitious climb past someone doing a clear-out
Uneven, and interesting for it. The Waxing Crescent is climbing toward something new; the Last Quarter, 135 degrees off, is sorting what they believe and recycling half of it. On a Sunday that looks like one of you drafting a five-year plan while the other questions the premise of five-year plans. The help goes both ways, rarely the help either expected. The Last Quarter points out what you can leave at the foot of the climb; the Crescent reminds someone busy with endings there is still a shed to build. Patience and respect keep it from jarring.
Waxing Crescent + Waning Crescent 4/10 · Friction
One is packing for the trip, the other just got home
Ninety degrees apart, and you face different directions, more literally than it sounds. The Waxing Crescent is turned toward the future and the climb. The Waning Crescent is turned inward, toward what things meant and what is ending, and would like the lights lower. It feels like a blanket pulled from both sides of the bed: forward, inward, forward. The friction gives way when you stop correcting each other's pace. The quiet one restores what the busy one spends, and that is a service. Rushing them does not work. Retreating from them does not either.
First Quarter pairings
First Quarter + First Quarter (same phase) 5/10 · Balanced
Each of you thinks you are the one driving
You spotted each other and both of you thought: finally, someone who moves. That lasts until the first decision with two answers. Two First Quarters have the same engine, action as the cure for tension, and the same lack of brakes, so the collisions are about who decides rather than what. Impatience is shared. So is a taste for a scrap, and neither of you softens it. Aimed at one target the force is remarkable: a garage cleared in a weekend, a business off the ground by spring. Aimed at each other it is noise. Pick the target.
First Quarter + Waxing Gibbous 8/10 · Easy
The demolition crew and the finisher
The First Quarter knocks the wall through on Saturday morning. The Waxing Gibbous spends the next fortnight making the edges straight, and both are happy, which is the tell for a good pairing. Force from one side, precision from the other, 45 degrees apart on the waxing half so the drive underneath is the same and needs no translating. The two of you build things both bold and well made, rarer than either quality alone. The only maintenance is mutual: the doer respects the standards, the finisher trusts the momentum, and nobody sulks about the dust.
First Quarter + Full Moon 2/10 · Intense
Decide now, or feel it through first
Two out of ten, and the number is fair, though it describes effort rather than worth. This is the hard square: the First Quarter wants to decide tonight and start tomorrow, the Full Moon needs to feel and weigh it and see how it sits with everyone before moving. Both of you are being reasonable. It lands as one person stalled and one steamrolled, and the argument about the sofa is never about the sofa. What helps is unglamorous. The doer slows down enough to ask. The aware one moves before every angle is examined, monthly, on purpose.
First Quarter + Waning Gibbous 5/10 · Balanced
Halfway up the ladder, still being told how to climb it
There is a silence when someone is halfway up the ladder and someone else is still explaining how to hold a ladder. That is this pairing at 135 degrees. The First Quarter acts and builds. The Waning Gibbous reflects, then shares, at length, and means well. On a good day the advice is the perspective the doer would never stop to get, and the doing turns the teacher's ideas into something with a shape. On a bad day it is a sermon delivered to a back. Respect makes the difference, and it has to be visible from both sides.
First Quarter + Last Quarter 5/10 · Balanced
Both born at a right angle, facing opposite ways
Each of you was born with the Sun and Moon at right angles, one waxing, one waning, 180 degrees apart. Both run on tension and treat a crisis, in the old sense of a turning point, as fuel. Different registers, though. The First Quarter builds by deciding and doing; the Last Quarter reforms by questioning and letting go, so one of you is assembling the flat-pack while the other asks why we own so many chairs. You respect each other's intensity. Sequence it, clearing then building, and you shift things others gave up on.
First Quarter + Waning Crescent 4/10 · Friction
Full speed next to someone who has just sat down
The First Quarter is by the door with the keys. The Waning Crescent has made tea and is not, in any meaningful sense, coming. Tempos this different do not match on their own, and the 135 degree angle does not help, so left to run it wears: one of you feels pushed around, the other feels dragged. Try treating the difference as ballast rather than obstruction. The quiet one is the reason the fast one has not burnt out. The fast one is the reason the quiet one has been outside this month. Neither is a small contribution.
Waxing Gibbous pairings
Waxing Gibbous + Waxing Gibbous (same phase) 6/10 · Balanced
Two editors and no one to say it is finished
Two Waxing Gibbous Moons understand something most people find exhausting: the last bit matters, and it is worth a Sunday. Together you produce things that are properly good, because neither lets the other stop at nearly. The same instinct is the fault line. Criticism comes easily to both and lands hard from someone with your standards, and the restlessness doubles, so the finish line moves every time you approach it. Say the progress out loud, over the washing up. Then remind each other that the goal was completion and flawless was never on the brief.
Waxing Gibbous + Full Moon 9/10 · Effortless
The rehearsal and the opening night
Nine out of ten and, by most accounts, deserved. The Waxing Gibbous prepares; the Full Moon presents. One of you readies the thing, past the point anyone else would bother, and the other brings it into the light and says what it is, so the rhythm feels like build-up followed by arrival. Forty-five degrees apart, just before and just at full, the purposeful drive is shared and neither has to justify caring this much. Apart, the perfecter never quite launches and the Full Moon launches too early. Together things get a clearer, fuller finish than either manages solo.
Waxing Gibbous + Waning Gibbous 5/10 · Balanced
Still polishing it, versus already telling everyone
Both nearly full, one filling, one emptying, and 90 degrees apart. The Waxing Gibbous is head down, getting it right, and does not want to discuss it yet. The Waning Gibbous learnt the lesson last week and has told the neighbours and a stranger on a train. You miss each other: one facing inward toward the work, the other outward toward an audience. What settles it is a trade of courtesies. The refiner lets feedback in before the thing is perfect. The teacher treats unfinished work as unfinished, not as a draft to narrate.
Waxing Gibbous + Last Quarter 5/10 · Balanced
Perfecting a thing the other is not sure should exist
The Waxing Gibbous has spent three evenings improving the spreadsheet. The Last Quarter, 135 degrees away, would like to know why there is a spreadsheet. That is the friction, and it frustrates both of you: watching someone polish what you want to dismantle, or dismantle what you are polishing. Patience is the price of admission. The return is that the reformer stops the refiner perfecting the wrong thing, a habit perfecters underreport, and the refiner keeps reminding the reformer that some things deserve finishing. Done properly, you sharpen each other like a knife on a steel.
Waxing Gibbous + Waning Crescent 6/10 · Balanced
Striving meets someone who put striving down
An opposition, felt from across the flat. One of you is refining, still at it at midnight. The other has put striving down and is in the garden, at peace with things as they are. The attraction runs on that contrast: focus and standards on one side, calm and a longer view on the other. The trouble is translation. To the Waning Crescent, perfectionism is a noise that will not stop. To the Waxing Gibbous, acceptance looks like giving up. Taken in turns, one of you teaches effort and the other ease, and both lessons take.
Full Moon pairings
Full Moon + Full Moon (same phase) 6/10 · Balanced
Nothing gets past either of you
Neither of you misses anything, and the first weeks are extraordinary. Two Full Moons read each other completely, feel everything at full volume, and each learns who they are from the other, the Full Moon way. The depth is real. So is the wattage. Feelings amplify rather than settle, closeness swings to distance and back inside a weekend, and each looks to the other for a balance neither carries alone. What lasts is a rota. One of you is steady this week. Then swap. And leave each other room to be seen completely, which is what you came for.
Full Moon + Waning Gibbous 9/10 · Effortless
Seen clearly by one, then handed on by the other
Just at full and just past it, 45 degrees apart, and one of the easiest pairings in the set. The Full Moon sees the whole thing and feels its meaning. The Waning Gibbous takes that understanding and gives it away, to the friend on the phone, in words the Full Moon would not have found. Insight from one, translation from the other. Evenings end with both of you knowing more than you started with, a decent definition of a good relationship. Both of you make meaning from what happens. Lessons get learned and, unusually, passed on.
Full Moon + Last Quarter 3/10 · Friction
Reaching for the other person while they are taking stock
A square between the phase that wants everyone in the room and the one that wants it emptied to think. Full Moons find themselves through other people, balance and the whole view. Last Quarters go inward, question what they were handed, drop a fair bit of it, and prefer to do it alone. So you point different ways at the moments that matter: one reaching out, the other pulling the shutters down. The effort required is specific. The Full Moon respects the withdrawal without reading it as rejection. The Last Quarter stops reading a hunger for connection as shallowness.
Full Moon + Waning Crescent 6/10 · Balanced
Bright lights and a preference for the lamp
Gentle, if a little lopsided. The Full Moon is lit up by other people, expressive, at their best in a full house. The Waning Crescent is happiest once the guests have left, thinking about what it all meant. The angle is 135 degrees, awkward in the astrologers' scheme, and it shows up as one of you saying come out and the other saying you go. Each has something the other is short of. The quiet one hands over perspective and a settled calm. The bright one, connection and heat. It works while the invitation stays an invitation.
Waning Gibbous pairings
Waning Gibbous + Waning Gibbous (same phase) 8/10 · Easy
A conversation that has not stopped since the first date
Two Waning Gibbous Moons can talk. Really talk, in the car and on the landing at one in the morning after saying goodnight twice. Both of you make sense of life by explaining it and both want to help, so the understanding is immediate and the social gift is real: friends leave your house wiser. The shared fault is one fault. You preach a little. You wait for your turn rather than listening, mostly to each other, because they can take it. Stay curious about what they actually think. Better than two monologues in parallel.
Waning Gibbous + Last Quarter 8/10 · Easy
One says what they learned, the other tests whether it holds
Forty-five degrees apart on the waning side, so both are past the peak and interested in what things mean, a solid base. The Waning Gibbous reflects and then shares; the Last Quarter turns the idea over, tests it against the real world, and rebuilds with whatever survives. You are lively together, the way a good seminar is lively: a claim, then a challenge, then something better than both. Generosity both ways keeps it good. The teacher stays open to being argued with. The reformer says, when it is true, that the idea came from you first.
Waning Gibbous + Waning Crescent 5/10 · Balanced
Someone talking, someone who has gone quiet
Both waning, both interested in what things meant, and still 90 degrees apart, a square, and it shows in the volume. The Waning Gibbous wants to stay engaged, keep the evening going. The Waning Crescent is drifting toward the quiet, ready to put things down. You miss each other's rhythm: reaching out on one side, pulling back on the other. Two conditions ease it. The talker treats the silence as a place rather than an absence. The quiet one brings the depth up, since without it the talker has nothing worth saying. Expression and reflection, in turns.
Last Quarter pairings
Last Quarter + Last Quarter (same phase) 5/10 · Balanced
Neither of you takes anything as given
Handed a belief, both of you check it first, and finding another person like that is bracing. Two Last Quarters respect each other's independence, both live slightly ahead of the calendar, and validate what the rest of the world calls difficult. That is the good week. The other week is two sets of conclusions, held tight, and nobody in the house who compromises. Loneliness can double; out of step together is still out of step. Point the dismantling outside the relationship, at a bad system or an inherited rule you both want gone. Then you are a team.
Last Quarter + Waning Crescent 8/10 · Easy
Letting go, and then being at peace with it
The last two phases before the dark, 45 degrees apart, and both face inward. The Last Quarter does the active part of an ending: decides it no longer fits and takes it down. The Waning Crescent does the quiet part: accepts, and reflects on what is left. Between you an ending gets done thoroughly and then grieved properly, more than most couples manage with a house move, let alone a belief. You share a sense of what endings are for. Transitions that flatten other people, you move through with a peace that looks, from outside, like practice.
Waning Crescent pairings
Waning Crescent + Waning Crescent (same phase) 6/10 · Balanced
Two old souls who never need the radio on
Two Waning Crescents can sit in a room for an hour without talking and both call it a good evening. The understanding is intuitive and soothing, from shared priorities: meaning over motion, the inner life over the rush of starting things. Neither of you is frightened of something finishing. The shadow is the same in both and so nobody corrects it: withdrawal that shades into escapism, and a habit of skipping the beginnings your lives still need. Keep the depth. Take turns being the one who says we should go out, and then actually go.
Beyond the two moon phases
Your birth Moon phase describes a rhythm, and a rhythm is only the first page of a chart. The Moon's zodiac sign, shown for each person in the result above, is what astrologers use for how you give and take care, and the birth moon phase tool reads your own phase at length. From there, a lot of couples compare how they each handle the big turning points, which is where a Saturn return gets interesting.
However the moons line up, astrology does its best work as a mirror and a prompt for a kinder conversation, and its worst work as a rulebook. Two birth dates are enough to notice something true about how your rhythms mesh; the rest is the two of you. Everything here is computed in your browser, so you can compare as many pairings as you like and nothing is stored or sent anywhere.
Moon phase compatibility questions
What people ask most about comparing two birth moon phases.
What is moon phase compatibility?
It compares the Moon phase each of you was born under and asks how those two rhythms sit together. Astrologers give each phase a temperament: a new Moon starts things, a first quarter pushes, a full Moon sees everything, a waning Moon reflects and lets go. Some pairs share a direction and move easily. Others rub, and the rubbing is where people say they grew. It is a light way to compare two temperaments.
How does moon phase compatibility work?
Enter two birth dates. The calculator finds each person's birth phase from the Sun-Moon angle on that day, then looks up the pairing, one of 36. Phases next to each other in the cycle share a direction and flow. Opposites, 180 degrees apart, pull at each other, attraction and challenge in one package. Same-phase pairs understand each other instantly and share the same blind spot. Each pairing gets a score out of 10 and a paragraph on what it looks like in practice.
Is this the moon phase soulmate test from TikTok?
Partly. The TikTok test has each of you look up the Moon on your birthday and overlay the two pictures; if the lit halves fit into one full circle, you are soulmates. It is a photo edit, and it is not astrology. Two Moons that complete a circle are simply 180 degrees apart, which this calculator scores as an opposition, between 5 and 7 out of 10. This is the version with maths under it: it computes the phase each of you was born under and scores how those rhythms fit.
Is moon phase compatibility accurate?
It is a lens, and I would not call it a verdict. The astronomy is exact; the meaning is what astrologers attach to it. Reading the pair can make you notice something true about how your rhythms mesh, but a relationship runs on things no chart measures: communication, values, timing, effort, who empties the bins. A low score is a note about where patience is needed. A high score is encouragement. Neither is a rule about who to love.
What is the best moon phase match?
There is not one. On this site's chart the top score is 9, and four pairings get it: new Moon with waxing crescent, new Moon with waning crescent, waxing gibbous with full, full with waning gibbous. All four are neighbours, 45 degrees apart, which is what easy momentum looks like. Opposites score lower and pull harder. A high number means the two of you rarely have to translate. Plenty of good relationships are built on pairings that make you translate constantly, and grow for it.
Do we need our exact birth times for moon compatibility?
No, and the calculator does not ask for them. I read each date at noon UTC, so the result does not shift with your time zone, and since a phase lasts a little under four days most birthdays sit well inside one. The exception is a date that straddles a phase change. For that, the birth moon phase calculator on this site takes a time and a city and pins the Moon to the hour.
Can two people with the same moon phase be compatible?
Yes. The eight same-phase pairings score between 5 and 8 on the chart, which is the astrologers' view that people who share a rhythm understand each other without explaining. Two new Moons start things together and neither finishes them. The catch is that a shared rhythm is a shared blind spot, and nobody in the house supplies the missing angle. These pairs do best when each of you takes a turn being the one you are not.
What does it mean if our moon phases are opposite?
Opposite phases, new and full for instance, are 180 degrees apart, and astrologers call the pull between them magnetic. The attraction is usually the difference itself: one of you acts on instinct, the other reflects first, and each sees what the other walks past. The challenge is the same difference on a bad day. Treated with some respect, the two of you cover each other's gaps, which is why the four opposite pairings score in the middle of the chart rather than the bottom.