Interactive Precision Tool

Natal Birth Chart Calculator

Deterministic tropical ephemeris calculation processed ephemerally on your device using astronomy-engine.

16th-Century Brass Planispheric Astrolabe with Stereographic Coordinate Rete

Complete Natal Birth Chart Calculator

100% Ephemeral Client Computation: 100% client-side — your birth data is never stored or transmitted.
1. Date of Birth & Time of Birth

Gregorian civil birth date · Format: YYYY-MM-DD

2. Place of Birth

Search by city or town. We look up coordinates and timezone automatically — 100% privately on your device.

If location is unknown, planetary sign placements are calculated accurately. Houses and Rising sign are omitted to maintain integrity. Offline geographical data provided by GeoNames (CC BY 4.0).
3. Advanced Chart Settings & Profile
Used for personal reading title on this device only
Signature Natal Atlas ($9.95 · 22–26 Pages): Your free reading, 1-page Quick Snapshot, multi-page Free Personal Report PDF, and 4-Ratio Share Pack above remain 100% complete and free forever. Commission the archival dossier below only if you want the full 20–26 page multi-chapter monograph.
House Division Geometry

Whole Sign vs. Placidus House Systems

Your birth chart divides the 360° celestial sphere into twelve experiential houses. Compare the ancient Hellenistic Whole Sign method (30° equal zodiacal signs) with the Renaissance Placidus system (time-proportional diurnal arcs).

✦ MODERN VISUALIZATION — ARTIFACT-INSPIRED ✦

Celestial Sphere Projection & House Cusps

Comparing Hellenistic Whole Sign equal sectors with Placidus quadrant temporal space division across Horizon and Meridian axes. • Modeled after 16th-century European brass astrolabe horizon plates (Arsenius / Cole tradition)

Celestial Sphere Projection & House Cusps Comparing Hellenistic Whole Sign equal sectors with Placidus quadrant temporal space division across Horizon and Meridian axes. ASC Eastern Horizon DSC Western Horizon MC (Midheaven) Upper Meridian (Culmination) IC (Imum Coeli) Lower Meridian (Anti-Culmination) DIURNAL HEMISPHERE (ABOVE HORIZON) NOCTURNAL HEMISPHERE (BELOW HORIZON) 1 2 3 4 5 6 7 8 9 10 11 12 TERRESTRIAL OBSERVER (LAT / LONG)
TERRESTRIAL OBSERVER

(LAT / LONG) — Local Geocentric Topocentric Origin

Cardinal Astrometric Angles
ASC Eastern Horizon
DSC Western Horizon
MC (Midheaven) Upper Meridian (Culmination)
IC (Imum Coeli) Lower Meridian (Anti-Culmination)
House Traditional Domain Key Astrological Themes
1 Vita ASC (Eastern Horizon) Self, Identity & Physical Body
2 Lucrum House 2 Values, Assets & Material Security
3 Fratres House 3 Mind, Siblings & Local Environment
4 Genitor IC (Lower Meridian) Home, Roots & Ancestry
5 Nati House 5 Creativity, Joy & Speculation
6 Valetudo House 6 Daily Work, Wellness & Service
7 Uxor DSC (Western Horizon) Partnerships, Marriage & Others
8 Mors House 8 Shared Resources & Transformation
9 Iter House 9 Higher Learning, Philosophy & Travel
10 Regnum MC (Upper Meridian) Career, Vocation & Public Standing
11 Benefacta House 11 Community, Alliances & Future Hopes
12 Carcer House 12 Subconscious, Solitude & Transcendence

Celestial Sphere Projection & House Cusps
Baroque copperplate celestial planisphere from Andreas Cellarius's Harmonia Macrocosmica (Amsterdam, 1660 CE) depicting zodiacal ecliptic spheres and terrestrial horizon circles
Early Modern European Cartography Tier B: Documented Historical Material

Harmonia Macrocosmica — Ptolemaic Celestial Planisphere

Engraved for Andreas Cellarius's monumental star atlas Harmonia Macrocosmica (Amsterdam, 1660), this copperplate celestial planisphere illustrates how classical geocentric astronomy projected the 360° zodiacal ecliptic belt, celestial equator, and local horizon circles around an earthly observer to measure rising signs and meridian culminations.

Period
1660 CE (Dutch Golden Age)
Site / Origin
Amsterdam, Netherlands (Johannes Janssonius Press)
Collection
University of Amsterdam Special Collections (OTM: HB-KZL I 2 A 4)

Privacy & Astronomical Precision Standard

All planetary coordinates, house cusps, and natal aspect angles are calculated using astronomy-engine v2.1.19 (MIT, VSOP87 analytical planetary theory & ELP2000-82 lunar theory). Your birth date, time, and coordinates remain local and ephemeral on your device and are never sent to external servers or logged in databases.

Read our full Astrological Methodology Standard →

Explore Planetary Concepts & Placements