Playground
Compute a chart in your browser
Every chart below is computed on this page by the caelus engine with its embedded dataset. No server, no ephemeris files.
Times are UT. For a local birth time, convert with caelus-birth first (a four-hour timezone error moves the ascendant about 60°).
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Accuracy (vs reference, 1900–2099)
| Sun–Saturn | ≤ 1″ |
| Uranus / Neptune | ≤ 1.9″ / ≤ 4.6″ |
| Moon (1920–2080 tier) | ≤ 2.5″ |
| Moon (series, embedded) | ≤ 10″ |
| Pluto / Chiron | ≤ 2.5″ / ≤ 1″ |
| Angles & Placidus cusps | ≤ 3.2″ |
| True node | ≤ 1′ vs SE built-in (≤ 1″ vs JPL DE431) |
| Mean Lilith | ≤ 1.3″ |
| 8 new house systems | exact (0.0″) |
| Rise/set/transit | ≤ 0.5 s |
| Crossings & phases | ≤ 4 s |
| Asteroids (big 4 + Pholus) | ≤ 1″ |
| Uranian bodies | ≤ 2.3″ |
| Fixed stars | ≤ 0.3″ |
| Sidereal (7 ayanamsas) | ≤ 0.005″ added |
| Eclipses | types exact; max ≤ 9 s |
Within 1′ chart-display precision. Full table →
Example charts
Four charts chosen to stress the caelus-wheel renderer: the canonical fixture, a polar Placidus fallback, a tight stellium with collision-avoided glyphs, and an equal-house chart.