Six Charts. One Complete System.
From natal birth chart to synastry, progressions, and solar return — powered by VSOP87B and verified against NASA JPL Horizons.
Sub-arcsecond precision · Sun–Neptune within 0.01° of NASA JPL
View Verification →All Six Chart Types
Natal Chart
Your complete birth chart — the foundation of Western astrology. Shows planets, houses, and aspects at the exact moment of your birth. The essential starting point.
The Big Three
Your Sun, Moon, and Rising signs — the three pillars of your personality in Western astrology. The fastest way to understand your core nature.
Transit Chart
Current sky planets overlaid on your natal chart. See which areas of life are activated right now and what cosmic weather you’re navigating today.
Synastry Chart
Two natal charts overlaid to reveal planetary connections between two people. See harmonies, tensions, and the energetic dynamic of any relationship.
Composite Chart
The midpoint chart of two people — a single chart representing the relationship itself. Shows the relationship’s purpose, strengths, and challenges.
Solar Return Chart
A full chart cast for the exact moment the Sun returns to your natal position each year. Your personal new year chart — themes, opportunities, and focus areas for the coming 12 months.
Progressed Chart
Secondary progressions — 1 day after birth symbolizes 1 year of life. Shows the slow inner evolution of personality and life themes over time.
Chart Comparison
| Feature | Natal | Transit | Synastry | Composite | Solar Return | Progressed |
|---|---|---|---|---|---|---|
| People needed | 1 | 1 | 2 | 2 | 1 | 1 |
| Time sensitivity | Birth | Live | Birth ×2 | Birth ×2 | Annual | Age-based |
| House system | ✓ | ✓ | A only | Composite | ✓ | ✓ |
| Aspects shown | Natal | Cross | Cross | Composite | SR | Progressed |
| Tier | 2 | 2 | 3 | 3 | 3 | 3 |
| Best for | Self | Now | Partners | Couple | Year ahead | Growth |
Frequently Asked Questions
Everything you need to know about Western astrology charts.
Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune: VSOP87B full series (Bretagnon & Francou 1987)
Moon: Meeus Astronomical Algorithms Chapter 47 — full 60-term series
Pluto: Meeus Chapter 37 — trigonometric series (43 terms) + IAU 1976 precession
Transneptunian planets: Hamburg School mean motion from J2000 epoch
Ascendant & MC: GAST → LMST → atan2 quadrant-safe formula
House cusps: Placidus iterative (default), Whole Sign, Equal
Aspects: Major (conjunction 0°±8°, sextile 60°±6°, square 90°±8°, trine 120°±8°, opposition 180°±8°) + minor set
Solar Return: Newton–Raphson iteration on Sun longitude, converges in 3–5 iterations, precision <0.001°
Progressions: Secondary (1 day = 1 year), chart cast at progressed date with birth time and location
How This Works: Full engine breakdown + NASA JPL accuracy verification →