How to read this
Every position on the wheel is computed locally with the
Swiss Ephemeris.
The Δ JPL column is that longitude minus the apparent ecliptic longitude
NASA/JPL Horizons
reports for the same instant — the observed sky and the zodiac circle on one 360° scale.
A second check queries Astrodienst's own swetest at astro.com.
TheSkyLive is polled too, and
reports blocked when its bot protection turns the server away; the per-body links
below still open the live page. What SkyLive would add — brightness, constellation, rise and
set — is computed locally for any date, in the body’s detail panel.
Con is the constellation a body really stands in front of. Signs and constellations
share names but have drifted apart by precession: about 24° today, far more in the deep past.
The 3D views show the same chart in space: the zodiac is the band of sky the planets
travel along, with the real constellations just beyond it and the plane of your horizon
through the Earth — everything above that plane is up in your sky. The slider under the view
moves through time; red stretches of a planet’s path are where it goes retrograde.
Keys: space live/pause · ←/→ step an hour (shift for a day) · r re-check · esc clear selection.