WESTERN ASTROLOGY

Discover your birth chart

A snapshot of the heavens at the moment you arrived — calculated to arcsecond precision using the same ephemeris models trusted by professional astronomers. Every placement is accompanied by an in-depth reading; nothing is held behind a paywall.

YEAR
MONTH
DAY
HOUR (24H)
MINUTE
REGION
Optional — but required for your Ascendant and the 12 houses.

All you need is a date — but the more precise your time, the more accurate your reading. Inner planets shift quickly; the Moon can move an entire sign in a single day.

WHAT IS A BIRTH CHART

A map of the sky at the moment you arrived

A birth chart — also called a natal chart or horoscope — is a precise diagram of where the Sun, Moon, and planets stood in the sky from your point of view at the instant of your birth. It is not a forecast. It is a coordinate system.

Western astrology divides the ecliptic — the apparent path of the Sun against the stars — into twelve equal 30° segments called signs of the zodiac. As Earth orbits the Sun, and the Moon and planets pursue their own orbits, each body crosses through these segments at its own pace. The Sun takes about a month per sign. The Moon, about two and a half days. Pluto, more than a decade. The chart records exactly where each body sat the moment you took your first breath.

What a thoughtful reading offers is not prediction, but a vocabulary — a way to describe the rhythms, tensions, and gifts that have been part of you since the beginning. Read carefully, it can be a tool for self-understanding. Read carelessly, it can be entertainment. We treat it as the former.

How to read your chart

The chart is dense, but it reads in layers. Start broad, then go deeper.

  1. 01

    Begin with the Big Three

    Your Sun sign is the role you are here to grow into — your core self. Your Moon sign is your emotional body — what calms you, what triggers you, the inner life only you fully know. Your Mercury sign is the texture of your mind. These three together usually describe more than any one alone.

  2. 02

    Notice the elements and modalities

    Each of the twelve signs belongs to one of four elements — Fire, Earth, Air, Water — and one of three modalities — Cardinal, Fixed, Mutable. Count where your planets fall. A chart heavy in Water suggests an emotional temperament; one heavy in Air, an intellectual one. A chart with many Fixed placements tends toward persistence; one with many Mutable, toward adaptability.

  3. 03

    Read the personal planets next

    Venus, Mars, Jupiter, and Saturn shape how you love, act, expand, and discipline yourself. They move slowly enough to feel personal but fast enough to differentiate you from your generation. Their sign placements tell you how — not whether — you do these things.

  4. 04

    Hold the outer planets lightly

    Uranus, Neptune, and Pluto move so slowly that millions of people share their sign placements. Read them as generational currents rather than personal traits. They tell you what your cohort is here to wrestle with, rather than what makes you uniquely you.

The ten luminaries

Astrology speaks of ten bodies — the two luminaries (Sun and Moon) and eight planets, including Pluto. Each governs a domain of human experience.

Sun

Identity

will

vitality — who you are at your core. The Sun shows the role you are here to play and the energy you radiate.

Moon

Emotional body — your instincts

comfort

and inner world. What soothes you and how you respond when no one is watching.

Mercury

Mind — how you think

learn

and exchange ideas. Communication style and the way you process information.

Venus

Love

beauty

and values — how you relate

what you find pleasurable

and how you express affection.

Mars

Drive — courage

desire

and the way you assert yourself. How you act when you want something.

Jupiter

Growth and meaning — where you expand

what brings luck

and the philosophies you live by.

Saturn

Structure and discipline — life lessons

the boundaries that shape you

and the work that matures over time.

Uranus

Awakening — the part of you that breaks convention

innovates

and demands freedom.

Neptune

Spirituality — dreams

imagination

dissolution of ego

and the longing for the transcendent.

Pluto

Transformation — the depths

what you must release

and the rebirth that follows.

The twelve signs

Twelve archetypes — four elements, three modalities — that color whatever planet moves through them.

Aries

Fire · Cardinal · Ruler Mars

Initiator. The spark. Aries energy is direct

brave

· Ruler

and impatient with delay — it begins what others only consider.

· Ruler

Taurus

Earth · Fixed · Ruler Venus

Grounded. Sensual. Taurus values steadiness

quality

· Ruler

and the slow pleasures — what is worth keeping is worth tending.

· Ruler

Gemini

Air · Mutable · Ruler Mercury

Curious. Multifaceted. Gemini gathers ideas

plays with language

· Ruler

and resists being pinned to one identity.

· Ruler

Cancer

Water · Cardinal · Ruler Moon

Tender. Protective. Cancer carries the instinct to nurture — home

memory

· Ruler

and emotional truth shape its world.

· Ruler

Leo

Fire · Fixed · Ruler Sun

Radiant. Generous. Leo is the heart on display — creative

warm

· Ruler

and proud of what it makes and whom it loves.

· Ruler

Virgo

Earth · Mutable · Ruler Mercury

Discerning. Devoted. Virgo refines

edits

· Ruler

and serves — finding meaning in care and the well-made detail.

· Ruler

Libra

Air · Cardinal · Ruler Venus

Relational. Aesthetic. Libra weighs

balances

· Ruler

and seeks beauty — in art

· Ruler

in fairness

· Ruler

in another person.

· Ruler

Scorpio

Water · Fixed · Ruler Pluto / Mars

Intense. Penetrating. Scorpio is unafraid of the depths — power

intimacy

· Ruler

and what others avoid feeling.

· Ruler

Sagittarius

Fire · Mutable · Ruler Jupiter

Seeking. Honest. Sagittarius hunts for meaning across geographies and ideas — restless until it understands.

Capricorn

Earth · Cardinal · Ruler Saturn

Ambitious. Patient. Capricorn builds slowly toward what it values — mastery is its long quiet pleasure.

Aquarius

Air · Fixed · Ruler Saturn / Uranus

Independent. Visionary. Aquarius belongs to the future — community

ideas

· Ruler

and the freedom to be oneself.

· Ruler

Pisces

Water · Mutable · Ruler Neptune / Jupiter

Imaginative. Empathic. Pisces dissolves boundaries — between self and other

dream and waking

· Ruler

ordinary and sacred.

· Ruler

How our chart is calculated

We use the open-source Astronomy Engine library, which implements modern precision ephemeris models — VSOP87 for the inner planets, expansions derived from JPL DE441 for the Moon, and IAU 2009 / 2015 resolutions for reference frames. Calculations are geocentric (Earth-centered) and reported in the tropical zodiac, referred to the mean equinox of date.

This is the same coordinate system used by every major astrological tradition since Ptolemy formalized it in the 2nd century AD. Positions are accurate to within an arcsecond — far finer than any astrologer needs, and finer than birth time records typically support.

A word on accuracy. The most common source of error in a birth chart is not the astronomy — it is the birth time. A difference of four minutes shifts the Ascendant by one degree. A difference of two hours can shift the Moon by an entire sign. If you do not know your birth time, the Moon position we give is our best estimate from noon UTC; treat it as provisional.

A word on interpretation. A chart is a starting point for self-inquiry, not a prescription. Astrology has been studied seriously for more than two thousand years, but it is not a science in the modern sense. We offer it in the spirit it was always offered — as a contemplative language, a mirror for what is already there.

Common questions

Why does my Sun sign sometimes seem wrong?

Because the Sun sign is one of ten placements. If your Moon, Mercury, and Venus all sit in a different element, your day-to-day experience may feel closer to those signs. The Sun is your core identity — but identity is not the same as personality.

What is the difference between tropical and sidereal astrology?

Tropical astrology — used in the West — defines 0° Aries as the spring equinox, regardless of where the stars sit. Sidereal astrology — used in Vedic / Jyotish traditions — anchors signs to the actual constellations. Because of precession of the equinoxes, the two systems now differ by about 24°. We use the tropical system here, consistent with Western astrological practice since Ptolemy.

Why do I need my birth time?

Two reasons. First, the Moon moves about 13° per day — roughly one sign every 2.5 days — so without a time, your Moon may be off by a sign. Second, the Ascendant (rising sign) and the houses depend entirely on birth time and place; they cannot be computed without them. If you do not have your time, focus on the slower planets.

Is the Ascendant calculated here?

Not yet. The Ascendant requires birth latitude and longitude in addition to time, and demands a house system choice (Placidus, Whole Sign, Koch, and so on — astrologers disagree). We chose to focus the first version on planet placements, which are far more universally agreed upon. A house-and-Ascendant version is on our roadmap.

Is astrology compatible with science?

The calculation of planetary positions is pure astronomy — the same math NASA uses to navigate spacecraft. The interpretation is a symbolic tradition, not a falsifiable science. We are careful not to confuse the two. Hold what you find here as a contemplative tool, not a verdict.

Find what resonates

Many of our pieces are named for the materials traditionally associated with a sign or luminary — Moonstone for the Moon, Amethyst for Pisces, Garnet for Aries. Pair your chart with the stones that meet you where you are.

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