Walk the Sun's yearly path on the ecliptic - tilted about 23.44 deg from the celestial equator - through 13 zodiac constellations including Ophiuchus, and see why precession shifts calendar signs away from the constellations.
The gold ring is the ecliptic - the plane of Earth's orbit as seen from the Sun's yearly track on the sky. The blue ring is the celestial equator. Their tilt is about 23.44 deg (Earth's axial obliquity).
Thirteen labeled markers sit along the ecliptic, including Ophiuchus. Tropical astrology keeps twelve equal signs; the constellation boundaries shift with precession over centuries.
Ecliptic Zodiac 3D Explorer
Walk the Sun's yearly path on the ecliptic - tilted about 23.44 deg from the celestial equator - through 13 zodiac constellations including Ophiuchus, and see why precession shifts calendar signs away from the constellations.
Drag to orbit the view, scroll or pinch to zoom, and press Pause path to freeze the Sun. Obliquity, Ophiuchus, Precession, and Equator vs ecliptic fill the facts panel.
The facts panel lists ecliptic tilt about 23.44 deg, thirteen zodiac constellations including Ophiuchus, and the precession literacy that tropical signs and constellation dates no longer match year to year.
- Earth and celestial equator ring as the spin reference
- Gold ecliptic ring tilted about 23.44 deg
- Sun marker walking the yearly path
- Thirteen constellation labels including Ophiuchus
- Distinct from Seasons Earth 3D Explorer and Parallax Distance 3D Explorer
- Runs fully in the browser with the vendored three.js engine - no account, no upload
Teachers use it to show why seasons track the tilt and why Ophiuchus appears on the ecliptic, students compare equator versus ecliptic rings, and curious readers separate tropical signs from constellation boundaries without a planetarium install.
| Quantity | Value | Source |
|---|---|---|
| Ecliptic obliquity | about 23.44 deg | Earth axial tilt / mean obliquity of the ecliptic |
| Zodiac constellations on ecliptic | 13 (includes Ophiuchus) | IAU constellation boundaries along the ecliptic |
| Tropical sign vs constellation dates | shifted by precession | Axial precession (~26,000 yr cycle) literacy |
Everything renders on your device with WebGL. The 3D engine loads once (about 0.7 MB) and is cached; no scene data is sent to a server.
The scene is an educational visualization - constellation markers are evenly spaced teaching labels, not precise IAU boundary polygons or an ephemeris.
For a step-by-step walkthrough, read the Ecliptic Zodiac 3D Explorer step-by-step guide. The Space 3D collection also includes a Seasons Earth 3D Explorer for axial-tilt seasons and a Parallax Distance 3D Explorer for distance geometry.
Frequently Asked Questions
What does Ecliptic Zodiac 3D Explorer show?
Earth with a blue celestial equator, a gold ecliptic tilted about 23.44 deg, a Sun walking that path, and thirteen zodiac constellation markers including Ophiuchus.
What is the ecliptic?
The plane of Earth's orbit around the Sun, which appears as the Sun's yearly path across the background stars. It is tilted about 23.44 deg from the celestial equator.
Why include Ophiuchus?
The Sun's path crosses thirteen official IAU constellations along the ecliptic. Tropical astrology traditionally uses twelve equal signs, so Ophiuchus is often omitted from newspaper charts even though it sits on the sky path.
What does precession change?
Earth's axis slowly precesses over about 26,000 years, so the dates when the Sun enters each constellation drift relative to fixed tropical calendar signs.
How is this different from Seasons Earth 3D Explorer?
Seasons Earth 3D Explorer focuses on axial tilt, solstices, and the subsolar point. Ecliptic Zodiac 3D Explorer isolates the ecliptic belt and zodiac constellation literacy including Ophiuchus.
Are the constellation labels exact sky maps?
No. Markers are evenly spaced teaching labels along the ecliptic ring - not IAU boundary polygons or a Hipparcos star catalog.