Assertion: tilt | /r/HasProperty | known to astronomer
Facets:
value: as the obliquity of the ecliptic
type: OTHER
Source sentences:
text: Earth's orbital plane is known as the ecliptic plane, and Earth's tilt is known to astronomers as the obliquity of the ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere.