Cast a birth chart

Positions to the arc-second, from the Swiss Ephemeris. Free, with no account, and nothing about you is kept.

Name

Names for numerologyOptional

Full name at birth

Name used now

The core numbers come from the full name at birth; if it’s left empty, from the name above. The name used now adds its minor numbers. Both stay on this device, with the chart.

Date

Time

I don’t know the time — we’ll use noon and mark the houses as approximate.

Place

OptionsPlacidus

House system

The most common system; houses stretch with latitude.

Time zone

The place’s full time-zone history, summer time included. Before standard time, the birthplace’s own Local Mean Time.

Calculated on this device: the date and time stay here; only the place is looked up through Ulune’s server.

Browse the encyclopedia See today’s sky in the Calendar

What Ulune is

Ulune casts your birth chart and explains it: where the Sun, the Moon and the planets stood when and where you were born, the houses they fell in and the angles between them. Human Design, numerology, Chinese astrology, BaZi and Feng Shui read the same birth data in languages of their own; the Calendar follows the sky day by day, and the encyclopedia explains the words.Ulune casts your birth chart and explains it: where the Sun, the Moon and the planets stood when and where you were born, the houses they fell in and the angles between them. Human Design, numerology, Chinese astrology, BaZi and Feng Shui read the same birth data in languages of their own; the Calendar follows the sky day by day, and the encyclopedia explains the words.

What you can do

AstrologyYour birth chart as a wheel or a table, with a written reading for each planet, house and aspect.Your birth chart as a wheel or a table, with a written reading for each planet, house and aspect.
Human DesignYour bodygraph, with your type, strategy, authority and profile.Your bodygraph, with your type, strategy, authority and profile.
NumerologyThe numbers of your birth date and full name at birth, and their cycles through life.The numbers of your birth date and full name at birth, and their cycles through life.
Chinese astrologyThe wheel of the twelve animals and your four, of the year, the month, the day and the hour, with the harmonies and clashes between them.The wheel of the twelve animals and your four, of the year, the month, the day and the hour, with the harmonies and clashes between them.
BaZiThe Four Pillars of your birth: your Day Master, the Ten Gods, the balance of the five phases and your luck pillars.The Four Pillars of your birth: your Day Master, the Ten Gods, the balance of the five phases and your luck pillars.
Feng ShuiYour Kua number and your eight directions; with Home, a home’s Flying Stars, from its facing and the year it was built.Your Kua number and your eight directions; with Home, a home’s Flying Stars, from its facing and the year it was built.
Natal · Cycles · Relationship · HomeThe tabs beside the language, as each has them: Natal, the birth chart itself; Cycles, the chart through time (transits, progressions; Human Design’s gates of the moment and life cycles; numerology’s years and life cycles; Chinese astrology’s year ahead; BaZi’s luck pillars; Feng Shui’s directions this year); Relationship, beside a second person’s; Home, a place, for Feng Shui. Compare sets up to four charts side by side.The tabs beside the language, as each has them: Natal, the birth chart itself; Cycles, the chart through time (transits, progressions; Human Design’s gates of the moment and life cycles; numerology’s years and life cycles; Chinese astrology’s year ahead; BaZi’s luck pillars; Feng Shui’s directions this year); Relationship, beside a second person’s; Home, a place, for Feng Shui. Compare sets up to four charts side by side.
CalendarDay by day, in layers by language: the sky, your transits and the solar terms; in View, you can add your personal year, month and day, the day’s animal, Feng Shui’s flying stars and the birthdays and returns of the charts you keep. It works without a chart too.Day by day, in layers by language: the sky, your transits and the solar terms; in View, you can add your personal year, month and day, the day’s animal, Feng Shui’s flying stars and the birthdays and returns of the charts you keep. It works without a chart too.
EncyclopediaA page for each word of astrology, Human Design and numerology, from Saturn to the life path, in English and French.A page for each word of astrology, Human Design and numerology, from Saturn to the life path, in English and French.

How to begin

Type the date, the time and the birthplace. The name is optional and never leaves this device.
Pick the place from the list, so its coordinates and time-zone history are exact.
Cast. The chart opens with its reading; above it, the language and its tabs lead to the rest.

No birth time? Tick “I don’t know the time”: Ulune uses noon and marks the houses as approximate.

New to charts?

A one-minute tour shows what each part of the screen does, on the chart you have open or on a sample. Or open the sample chart (1 January 2000, noon, Greenwich) and look around.

Glossary

Your data stays yours

No account needed, no cookies, no analytics, no advertising.
Charts are calculated on this device: the date, time and names stay here; only the place is looked up through Ulune’s server, which keeps nothing.
While you look, charts stay in the open tab and go when it closes.
To keep them, “Sign in” opens a private space on this device, sealed with AES-256-GCM under your passphrase, a passkey or a recovery code. Ulune can never read it, even synced.

Read the privacy notice

Precise, and open about it

Positions come from the Swiss Ephemeris, built from NASA JPL’s DE441, calculated on your device by default; the table shows them to the arc-second.
A birth time is read with the birthplace’s full time-zone history, summer time included; before standard time, with its Local Mean Time; before 15 October 1582, in the Julian calendar.
Ten house systems, Placidus by default. When the method has to change, a note under the chart says so: Porphyry houses inside the polar circles, for example.
Progressions: a day for a year, the angles advancing at the Naibod rate (0°59′08″ of right ascension a year).
Numerology follows Hans Decoz’s Pythagorean method: each name added on its own, a Y counted by its place, master numbers and karmic debts kept. The Chaldean number stands beside it, labelled, never mixed in.
The Chinese languages share one calendar: the solar terms and new moons, computed with the Swiss Ephemeris into a table for 1800 to 2200 that your device reads. The year turns at Lichun; the hour is read in true solar time and the day turns at 23:00, unless you choose otherwise in Settings.
Ulune’s code is public, under the GNU AGPL.

Source code (opens in a new tab)Credits

Questions

I don’t know my birth time.

Tick “I don’t know the time”. Ulune uses noon: the planets move little in half a day, except the Moon, which can be up to about 7½° off. The houses and the Ascendant depend on the exact time, so they are marked approximate.Tick “I don’t know the time”. Ulune uses noon: the planets move little in half a day, except the Moon, which can be up to about 7½° off. The houses and the Ascendant depend on the exact time, so they are marked approximate.

Which house system should I choose?

Placidus, the default, is the most common; whole sign is the oldest. Each has a line in the form’s options, and you can change it later by editing the chart.Placidus, the default, is the most common; whole sign is the oldest. Each has a line in the form’s options, and you can change it later by editing the chart.

Which name does numerology read?

The full name at birth, as on the birth certificate: every given name and the family name. Type it under “Names for numerology” in the form, with the name used now if it differs: a married or chosen name adds its minor numbers. If the full name at birth is left empty, numerology reads the chart’s name. Both names stay on this device.The full name at birth, as on the birth certificate: every given name and the family name. Type it under “Names for numerology” in the form, with the name used now if it differs: a married or chosen name adds its minor numbers. If the full name at birth is left empty, numerology reads the chart’s name. Both names stay on this device.

Why does the year animal change at Lichun, not Chinese New Year?

Lichun, the start of spring (around 4 February), is when BaZi and Feng Shui turn the year, so all of Ulune’s Chinese pages count from it and agree. Many people learned their animal from Chinese New Year, which falls between 21 January and 20 February: when the two give different animals, Chinese astrology’s page says which one New Year would give.Lichun, the start of spring (around 4 February), is when BaZi and Feng Shui turn the year, so all of Ulune’s Chinese pages count from it and agree. Many people learned their animal from Chinese New Year, which falls between 21 January and 20 February: when the two give different animals, Chinese astrology’s page says which one New Year would give.

What is the yin or yang count?

An optional choice in the birth form’s Options: classical Chinese traditions count a birth as yang or yin by sex. Only two calculations read it: the direction of BaZi’s luck pillars and Feng Shui’s Kua number; without it, both versions are shown. It is kept with the chart on this device, never sent.An optional choice in the birth form’s Options: classical Chinese traditions count a birth as yang or yin by sex. Only two calculations read it: the direction of BaZi’s luck pillars and Feng Shui’s Kua number; without it, both versions are shown. It is kept with the chart on this device, never sent.

Is Ulune free?

Yes: every chart, language and reading, with no subscription or advertising, and no account needed.Yes: every chart, language and reading, with no subscription or advertising, and no account needed.

Where are my charts kept?

While you look, in the open tab only. In a private space: on this device, sealed, and on your other devices if you sync it, as boxes Ulune can’t open. Download a backup now and then.While you look, in the open tab only. In a private space: on this device, sealed, and on your other devices if you sync it, as boxes Ulune can’t open. Download a backup now and then.

Can I trust the positions?

They come from the Swiss Ephemeris, which follows NASA JPL’s DE441 to a fraction of an arc-second, and Ulune’s tests compare them with reference charts. If one looks wrong, use “Report a problem”.They come from the Swiss Ephemeris, which follows NASA JPL’s DE441 to a fraction of an arc-second, and Ulune’s tests compare them with reference charts. If one looks wrong, use “Report a problem”.

Does Ulune use AI?

No. The readings that come with every chart are fixed texts, the same for everyone with that placement.No. The readings that come with every chart are fixed texts, the same for everyone with that placement.