What geometric feature is defined as the mathematical plane in which the Earth revolves around the Sun?

Answer

The ecliptic plane

The ecliptic plane is the fundamental reference plane corresponding to Earth's revolution around the Sun. When this plane intersects the celestial sphere, it forms the great circle known as the ecliptic.

What geometric feature is defined as the mathematical plane in which the Earth revolves around the Sun?

#Videos

The Ecliptic: Crash Course Kids #37.2 - YouTube

sunpathCelestial sphereEarth's orbit