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Earth Perihelion & Aphelion 3D Explorer vs alternatives
The Earth Perihelion & Aphelion 3D Explorer shows the orbit shape and the distance curve together in the browser - almanacs and ephemeris tools win for exact daily positions; astronomy textbooks win for the full derivation.
| Option | Strength | Access | Trade-off |
|---|---|---|---|
| Earth Perihelion & Aphelion 3D (this page) | Orbit + live distance curve together, day-of-year scrub, jump buttons | Free, in browser | Teaching approximation; not a live ephemeris |
| Old Farmer's Almanac / NASA fact sheets | Exact yearly perihelion/aphelion dates and distances | Free, published annually | No interactive 3D orbit scene |
| Astronomy textbooks | Full Keplerian derivation and orbital mechanics | Free/paid, education-focused | No 3D teaching scene |
Key published figures
| Figure | Value |
|---|---|
| Mean distance (1 AU) | 149,597,870 km |
| Perihelion (early Jan) | about 147.1 million km |
| Aphelion (early Jul) | about 152.1 million km |
| Eccentricity | 0.0167 |
Start with the step-by-step guide or when to use. Open the Earth Perihelion & Aphelion 3D Explorer.
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