Natal Chart Online
Complete astronomical snapshot of the moment of birth: Swiss Ephemeris planetary coordinates, house cusps, aspect grid, and essential dignities
✓ Instant precise calculation with no mandatory signup
- ✓ Swiss Ephemeris calculation precision down to 1 arcsecond (≤ 1″)
- ✓ 6 house systems supported: Placidus, Koch, Whole Sign, Equal, Regiomontanus, Campanus
- ✓ Sub-minute birth time precision with automated historical timezone resolution
- ✓ Special points computed: Part of Fortune (day/night sect), Lunar Nodes, Vertex, Lilith
Why This Technique Matters
Basic Natal Analysis · Astroprognostic
Inherent blueprint of personality
Planetary positions across zodiac signs and astrological houses reveal core psychological traits, innate talents, and pivotal life spheres.
Bedrock for all predictive techniques
Accurate transits, solar returns, or directions cannot be computed without a validated natal foundation. Any natal error cascades through all timing methods.
Structural aspect and pattern analysis
Stelliums, T-squares, grand trines, disposition chains, and essential planetary dignities illuminate inner psychological dynamics.
✅ What the Engine Calculates
- Swiss Ephemeris calculation precision down to 1 arcsecond (≤ 1″)
- 6 house systems supported: Placidus, Koch, Whole Sign, Equal, Regiomontanus, Campanus
- Sub-minute birth time precision with automated historical timezone resolution
- Special points computed: Part of Fortune (day/night sect), Lunar Nodes, Vertex, Lilith
✕ Can't do:
- Doesn't show WHEN events happen — for timing you need prognostics (transits, directions, progressions, returns).
- Without an accurate birth time (ideally to the second) the Ascendant, MC and house cusps are unreliable — the angles move roughly 15′ per minute of time.
How to Use in Astroprognostic
3 простых шага для построения и интерпретации в сервисе
Enter birth details
Provide date, exact time, and birth city — coordinates and timezone resolve automatically.
Explore the interactive bi-wheel
Hover over planets, house cusps, and aspect lines for instant astronomical tooltips.
Review comprehensive data tables
Examine essential dignities, elemental and quadruplicity balances, and house rulerships.
Case Study: The critical impact of birth time on house cusps
A shift of just 4 minutes in birth time moves house cusps by approximately 1 full degree. Near sign boundaries, this can shift the 2nd house cusp from Libra to Scorpio, completely changing the financial ruler from Venus to Mars/Pluto. Exact astronomical calculation eliminates ambiguity and provides solid ground for interpretation.
Frequently Asked Questions
Why is exact birth time down to the minute necessary?
The Ascendant and house cusps rotate through the zodiac at ~1° every 4 minutes (15′ arcminutes per minute of time). Inexact time distorts house placements.
Which house system should I select?
Placidus is the industry standard for modern predictive astrology. Hellenistic and traditional practitioners often favor Whole Sign houses.
What if birth time is completely unknown?
You can generate a noon cosmogram (planetary positions without houses) or use the Rectification workshop to deduce the time from documented life events.
Try Free on Your Chart Online
Instant precise calculation with no mandatory signup