ZEPHYR Solar Harmony →

The Natal Observatory

The sky you arrived under.

Generate a beautiful natal chart with planets, houses, angles, retrogrades, and major aspects—then read the chart in plain language. Zephyr brings that sky map together with a first-of-its-kind solar harmony instrument.

Create my free natal chart See what’s included
Stylized Zephyr natal chart A precise circular natal chart with twelve zodiac sectors, houses, planet markers, and aspect lines. NATAL Your chart SUN · MOON · RISING

What the chart includes

More than a Sun sign.

Planets and Big Three

See your Sun, Moon, Rising sign, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.

Houses and angles

Use your exact birth time and city to calculate the Ascendant, Midheaven, and twelve astrological houses.

Aspects and interpretation

Explore the major geometric relationships in the chart with readable, original explanations—not a wall of technical symbols.

Private by designYour saved birth profile stays in your browser. Chart calculations run locally instead of sending your birth details to an astrology API.
Open the Observatory

Questions people ask

Natal chart basics.

What information is needed for a natal chart?

Your birth date, exact local birth time, and birth city or coordinates. Time and location are essential for calculating the Rising sign, Midheaven, and houses.

Is the Zephyr natal chart free?

Yes. The chart generator is free to use in a supported web browser.

Does Zephyr store my birth information?

Saved profiles are stored locally in your browser. Zephyr does not send birth details to a third-party astrology calculation API.

What makes Zephyr different?

Zephyr is a first-of-its-kind interactive observatory bringing together a visual natal chart, approachable interpretation, and a solar harmony instrument that turns birthday spacing into musical intervals.

Zephyr Field Notes

Learn the chart without drowning in it.

What makes Zephyr different?

Private charts, visible evidence, approachable storytelling, and solar harmony.

 Big Three, houses, and aspects

A beginner guide that explains the whole chart in plain language.

 Read a sample portrait

Meet “The Velvet Scalpel”—a fictional report with warmth and teeth.

 Music of the spheres

Where celestial harmony came from and what Zephyr does with it.

 The Zodiac Tone Circle

How Kepler, the Circle of Fifths, and Zephyr approach celestial harmony differently.

 How birthdays become intervals

The real math behind dates, cents, notes, and birthday chords.