Orbital Calculator
Enter any year to compute all Holistic Universe Model predictions. Negative years represent BCE dates; decimal values are accepted (e.g., 2000,5 for mid-year — non-half values snap to the nearest 0.5 on blur). Use the arrow keys to step by 1 year (preserving the half-year offset). All calculations run instantly in your browser.
The calculator has two modes, selectable from the tabs at the top:
- Single Year — computes every output below for one specific year. When the year input rounds to 2000, a “J2000 reference values shown” badge appears and the orbital-elements and time-period tables display a side-by-side Model | J2000 Reference column for direct comparison against published IAU/NASA values.
- Batch Export — generates a CSV file covering a year range with configurable from/to/step values. Choose one of four datasets (Earth orbital elements, Earth time periods, all-planet perihelion precession, or all-planet orbital elements) and click Download CSV.
These values are computed using the same formulas documented on the Formulas page, ported to TypeScript. Planet fluctuation predictions use the unified ~2,400-term predictive formula (R² > 0.99998 for all planets). See per-planet accuracy metrics. The underlying Python source code is available on GitHub .
Output Reference (Single Year mode)
| Section | Description |
|---|---|
| Earth — Orbital Elements | Perihelion longitude, obliquity, eccentricity, inclination to invariable plane |
| Earth — Time Periods | Solar, sidereal, and anomalistic years (in days and SI seconds); solar day (LOD), sidereal day, stellar day; Earth semi-major axis (1 AU); Moon mean distance; Moon sidereal month; Earth Fundamental Cycle H — all evolved per epoch under deep-time (Driver 1: tidal recession, Driver 2: solar mass loss) |
| Earth — Cardinal Points | For each cardinal point (Vernal Equinox, Summer Solstice, Autumnal Equinox, Winter Solstice): date, Julian Day, RA (degrees), and year length (days) |
| Earth — Precession Periods | Axial, perihelion, and inclination precession periods |
| All Planets — Perihelion Precession | Perihelion longitude, baseline rate, fluctuation, and total precession for all 8 planets |
| All Planets — Orbital Elements | Ascending node longitude, inclination to invariable plane, and eccentricity for all 8 planets |
For the mathematical derivations behind each formula, see Formulas.