What planet rules the hour you were born?
Every hour of the day belongs to one of the seven classical planets, and the hours shift with sunrise and sunset. Enter a date, time and place of birth to see which planet ruled the hour — and the day — someone arrived. Then keep it as a poster.
How to find your planetary birth hour
The day is not divided into 24 equal hours in planetary time. Daylight, from sunrise to sunset, is split into twelve day hours; the night, from sunset to the next sunrise, into twelve night hours. A day hour runs long in summer and short in winter. The first hour after sunrise belongs to the planet of the weekday, and the hours that follow go through the Chaldean order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — then Saturn again.
So to find the planet that ruled the hour you were born, you need three things: the date (for the weekday), the time, and the place (for the sunrise and sunset that day). The calculator above uses the same sunrise and sunset engine as the Planetaro apps and the planetary hours calculator, so the result matches what you see on your phone, to the minute.
What your birth hour planet means
Each of the seven planets lends its character to the hour it rules. Here is the short version — the poster carries one line of it, the rest is yours to read into.
☉ Born in the hour of the Sun
Born in the hour of the Sun, you tend to take the centre of the room without trying. Warmth, visibility and a wish to be recognised run through your life; the lesson is to shine without needing an audience.
Rules Sunday☽ Born in the hour of the Moon
The Moon's hour gives a fine sense for mood and atmosphere: you feel the room before you walk into it. Memory, home and the people close to you matter more than most; the work is to keep your own shape inside the tide.
Rules Monday♂ Born in the hour of Mars
A Mars hour brings drive. You start things, you go first, you don't wait to be asked. Courage is the gift; patience, and finishing what you began, is the practice.
Rules Tuesday☿ Born in the hour of Mercury
Mercury's hour favours a quick mind: words, numbers, connections between things others keep apart. You explain, translate, trade and move; the risk is restlessness, the reward is reach.
Rules Wednesday♃ Born in the hour of Jupiter
Born in Jupiter's hour, you see the wide view and make room for others in it. Generosity, teaching and luck that comes from saying yes; the practice is knowing when enough is enough.
Rules Thursday♀ Born in the hour of Venus
Venus's hour gives an eye for what is beautiful and a talent for making peace. You make things — and people — a little lovelier. The lesson is that harmony sometimes needs an honest word first.
Rules Friday♄ Born in the hour of Saturn
A Saturn hour gives patience and a long memory. You build slowly and what you build lasts. Time is on your side; the work is to let yourself begin before everything is certain.
Rules SaturdayPlanet of the day and planet of the hour
The poster shows both. The planet of the day rules the whole planetary day, from sunrise to the next sunrise, and sets the first hour: the Sun on Sunday, the Moon on Monday, Mars on Tuesday, Mercury on Wednesday, Jupiter on Thursday, Venus on Friday, Saturn on Saturday. The planet of the hour rules only the hour you arrived in. Someone born on a Sunday afternoon in an hour of Venus is "a day of the Sun, an hour of Venus" — the two together say more than either alone.
One detail surprises people: a planetary day begins at sunrise, not at midnight. Born at four in the morning on a Monday, you arrived in the night hours of Sunday's planetary day, so the Sun is the planet of your day.
Get it as a poster
The poster draws the 24 planetary hours of your birth day as a ring, each hour where it fell on the clock, with the symbol of its planet. The pointer marks the minute you were born, the outlined segment is your birth hour, and its sign sits in the centre. Under the ring: the planet of the day, then your name, the date, time and place, and a line about your hour. Two styles: Almanac (classic type and one red accent, the look of an old astronomical yearbook) and Modern (clean type, with the planets in colour), each on a light or a dark background. You get print-ready PDFs in A-series and US sizes, plus a card that explains your poster, the moment you pay.
Questions
What planet rules the hour I was born?
The planet that rules your birth hour depends on the day of the week, the time of birth, and the sunrise and sunset at your birthplace. Daylight is split into 12 planetary hours and night into 12 more; each hour belongs to a planet in the Chaldean order (Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon). Enter your birth details above to find yours in seconds.
How are planetary hours calculated?
The time from sunrise to sunset is divided into 12 equal day hours, and from sunset to the next sunrise into 12 equal night hours. The first hour after sunrise belongs to the planet of the weekday — the Sun on Sunday, the Moon on Monday, Mars on Tuesday, Mercury on Wednesday, Jupiter on Thursday, Venus on Friday, Saturn on Saturday — and the following hours run through the Chaldean order.
Why do I need the exact time and place of birth?
A planetary hour lasts roughly an hour, longer on summer days and shorter on winter days. Where each hour begins depends on the sunrise and sunset at the place of birth, so both the time and the place are needed to find the right one. A birth certificate or hospital record usually has the time.
I was born before sunrise. Why does it show the day before?
A planetary day runs from sunrise to the next sunrise, not from midnight. Someone born at 4 am on a Monday arrived during the night of Sunday's planetary day, so Sunday's planet, the Sun, is the ruler of their day.
What is the difference between the planet of the day and the planet of the hour?
The planet of the day rules the whole planetary day, from sunrise to the next sunrise, and sets the first hour. The planet of the hour rules only the hour you were born in. Both appear on the poster: the hour planet as the title and in the centre of the dial, the day planet named just under the dial.
Will I receive a printed, framed poster?
No. Born in the Hour is a digital product: you receive PDF files right after payment and print them yourself, at home or at a print shop, in any size from A4 to A1 or 12×16 and 18×24 inches. Nothing is shipped and no frame is included. The framed posters in the photos are example prints.
What do I get when I buy the poster?
Two PDF files of your poster in the style and background you choose: one sized for A-series paper (A4 up to A1) and one for US frames (12×16 or 18×24 inches). They are vector files, so they stay sharp at any size. You also get an A4 card that explains what your poster shows, with your hour, your day and the details of your birth. You print them at home or at a print shop. The files are ready right after payment and cannot be returned.
Something is wrong with my file.
Write to [email protected] with the name and birth details and we'll fix it and send it again.