What a Zodiac Is
A 360° circle cut into twelve equal parts: a ruler laid along one circle in the sky.
A 360° circle cut into twelve equal parts: a ruler laid along one circle in the sky.
The Babylonians named the constellations along the Sun's path, then deliberately replaced them with twelve equal divisions of 30° — which is why the signs have never been the constellations.
Signs are divisions of the ecliptic. Right ascension is measured around a different circle, so a sign name attached to it would name a region the body is not in, which is why sign names are withheld.