The moon on my birthday
Just your date — and the calculator draws the exact Moon that hung over your first night.
✓ 60-day guarantee — if the Map tells you nothing of your own, full refund
What moon was there the day I was born?
☾ Read in the astrological tradition — a mirror for reflection, not science.
The Map of the Sky
Your Sun, your Moon, your rising — read as one story, not three parts. 28 pages. Your name on every one.
The book of your body: chronotype, your strong and weak hours, rest by season — calculated from your exact positions. 26 pages, yours forever.
An astrology consultation: $80–150 · the Map at opening: $19
forged one at a time — the bruxo writes each Map alone, start to finish
You came through the birth chart door — so the Map opens on your sky first.
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Not medical advice. For personal reflection and wellbeing. Astrology appears here as declared tradition — never as science.
This is how a Map is born
These are pages from a Map already forged — someone else's, with their name on top. Yours will speak about you: your hours, your body, your seasons.
28 pages — yours will speak of you
28 pages — yours will speak of you
28 pages — yours will speak of youTap the first seven to see them up close — the calendar included. The others stay veiled: they belong to the person who commissioned them.
What the moon phase of your birth actually is
A moon phase is not a property of the Moon: it's an angle. It's the angular distance between the Moon and the Sun as seen from Earth. When the two sit in the same direction, the face turned toward us stays dark and we call it a new moon. When they sit in opposite directions, that same face takes the sun full on and we call it a full moon. Everything in between is the eight phases of the cycle, and which one fell to you depends on a single piece of data: your date.
That's why this calculator asks for no hour and no city. The phase advances about twelve degrees a day — slow and even — so the date is enough to draw your moon accurately. It's the only piece of your natal sky you can recover without hunting for paperwork.
The full cycle lasts 29.53 days — the synodic month — and this page computes it with the Meeus lunar series, the same one behind astronomical almanacs. The percentage you see is the fraction of the visible disc that was lit by the Sun: 0% at new moon, 100% at full. Checked against published ephemerides, the engine lands within a couple of minutes of the true instant of every new and full moon. (ephemerides — U.S. Naval Observatory)
The eight moons and what the tradition reads in each
The old wheel splits the cycle into eight stretches, each with its own character. The new moon is the blind beginning: nothing visible, everything still to do. The waxing crescent is the first bet, placed while the thing still promises nothing. The first quarter is the shove against resistance. The waxing gibbous is the fine adjustment, the correction before showing your work. The full moon is complete exposure, with everything good and everything uncomfortable about being seen. The waning gibbous is the phase of telling what happened. The last quarter is the pruning. And the final waning crescent is the silence before the new beginning.
Reading someone's character from their birth phase is a relatively modern tradition inside astrology, popularised in the twentieth century, though it draws on a very old intuition: that starting life on a waxing moon is not the same as starting it on a waning one. We use it as a declared mirror, never as a forecast. It's legend, and we name it as such.
Why this moon gets shared so much
There's something strange and lovely about seeing the exact moon of your date drawn out: it isn't a generic sentence, it's an object. That disc up there held precisely that shape over the whole world the day you arrived — over the hospital, over the house, over the people who were waiting for you. It's the same sky your parents saw that night, if they stepped out to look.
And there's a fact everybody likes: that same moon comes back. Since the cycle lasts 29.53 days, your phase repeats thirteen times a year. The page tells you the next date on which the sky will repeat your natal moon — the anniversary nobody celebrates.
When someone asks me where to start, I tell them: with the moon of your birthday. You don't need the certificate, you don't need the city, you don't need to believe in anything. Just look. Afterwards, if something moved in you, we'll go find the rest of the sky.— the bruxo, of the apothecary
How to use your natal moon without losing your head
The reading this page gives you is a mirror, not a diagnosis and not a prophecy. It works exactly like a good question asked at the right moment: if you get a full moon and the reading talks about the balance between what you want and what the other person needs, the useful question isn't “is that true?” but “where is that happening to me right now?”. If it isn't happening, throw it away. A mirror that reflects nothing is no use, and forcing it is worse.
What the moon phase cannot tell you: how you sleep, what hour you perform, what to do with your exhaustion. That needs the whole sky of your birth crossed with what's known about rhythms, light and rest — and that is exactly the Natal Map of the Body: 26 pages computed from your exact positions, written in two inks. The apothecary is about to open: leave your email and the bruxo writes with your founder price.
Quick questions about your birth moon
Does it work for any year? Yes: the engine runs from 1930 to 2026 without losing precision, and internally it reaches much further. Does it hold in the southern hemisphere? The phase is identical across the planet — what changes is the orientation: what looks lit on the right in London looks lit on the left in Sydney. The disc on this page is drawn with the northern hemisphere convention, which is what almanacs use. And if you were born right on a phase change? Then the percentage tells you more than the name does: look at the number, not the label.
Questions that reach the apothecary
How do I know what moon phase there was on the day I was born?
What does the percentage illuminated mean?
How often does my moon phase come back?
Does the moon phase influence character?
Does the moon look the same in the southern hemisphere?
From the same shelf
- Moon sign calculator: which sign your Moon was in
- Rising sign calculator: the sign that was climbing your horizon
- Waking up at 3am: what the organ clock says
You’ve seen your moon: the exact shape the sky held the night you arrived, and the date it comes back.
But the phase is a single stroke of the drawing. Your full date says more: where the Moon stood, where the Sun stood, and what each one does with your hours and your rest — that is the Map of the Sky: 28 pages computed from your exact positions, yours for good.
Your moon returns thirteen times a year. Your Map is forged once.
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