The Earth's orbital plane is known as the ecliptic plane, and the Earth's tilt (23.5degrees) is known to astronomers as the obliquity of the ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere.
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The Earth's orbital plane is known as the ecliptic plane, and the Earth's tilt (23.5degrees) is known to astronomers as the obliquity of the ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere.