| Planet | Our Calc | NASA JPL | Delta | Status |
|---|---|---|---|---|
| ✓ ! · | ||||
| ♇ Pluto uses Meeus Ch.37 + IAU76 precession (ecliptic J2000 → ecliptic-of-date). All other bodies use VSOP87B full series or Meeus Ch.47 (sub-arcsecond). | ||||
NASA JPL Horizons — QUANTITIES=31 (ObsEcLon), J2000, AIRLESS
· refreshes
0 / 10
Planets < 1 arcsecond
Sun–Neptune · Pluto: ±0.5°
0/10
Planets verified
Within 0.05° of JPL
VSOP87B
Full series
840 Neptune terms
Algorithm Details
| Sun, Mercury–Saturn, Uranus, Neptune | VSOP87B full series (Bretagnon & Francou 1988) | <0.001° |
| Moon | Meeus Chapter 47 complete series (60 terms) | <0.005° |
| Pluto | Meeus Chapter 37 trigonometric series (43 terms) | <0.05° |
| Uranian TNPs | Hamburg School mean motion (conventional) | ~±1–2° |
Extended Points: Chiron, Lilith & Nodes — Sources & Accuracy
| Symbol / Point | Source | Current Accuracy |
|---|---|---|
| ☉ ☽ ♂ ♀ ☿ ♃ ♄ ♅ ♆ ♇ 10 classical planets |
Calenos Engine (VSOP87B / Meeus) | <0.05° |
| ☊ North Node Mean Node |
Meeus Chapter 47 formula | <0.1° |
| ☋ South Node Mean Node + 180° |
Derived from North Node + 180° | <0.1° |
| ⚸ Lilith Black Moon, Mean Apogee |
Swiss Ephemeris table, server-hosted (10-day steps, 1900–2101) | <0.1° |
| ⚷ Chiron Minor planet 2060 |
Swiss Ephemeris table, server-hosted (10-day steps, 1900–2101) + linear interpolation | <0.4° |
Roadmap
Planned: Swiss Ephemeris integration will bring Chiron and Lilith to sub-arcsecond precision (<0.001°), matching professional software such as Solar Fire and Astro.com.