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 β 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 β computes every output below for one specific year. When the year input rounds to 2000, a βJ2000 reference values shownβ 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 β 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 (RΒ² > 0.99998 for all planets). See per-planet accuracy metrics. The underlying Python source code is available on GitHubΒ .
Output Reference (Single Year mode)
| Section | Description |
|---|---|
| Earth β Orbital Elements | Perihelion longitude, obliquity, eccentricity, inclination to invariable plane |
| Earth β Time Periods | Solar, sidereal, and anomalistic years (in days and SI seconds); solar day, sidereal day, stellar day |
| Earth β Cardinal Points | For each cardinal point (Vernal Equinox, Summer Solstice, Autumnal Equinox, Winter Solstice): date, Julian Day, RA (degrees), and year length (days) |
| Earth β Precession Periods | Axial, perihelion, and inclination precession periods |
| All Planets β Perihelion Precession | Perihelion longitude, baseline rate, fluctuation, and total precession for all 8 planets |
| All Planets β Orbital Elements | Ascending node longitude, inclination to invariable plane, and eccentricity for all 8 planets |
For the mathematical derivations behind each formula, see Formulas.