Assertion: true horizon | /r/HasProperty | imperceptible
Facets:
value: for observers near sea level
type: TRANSITIVE-OBJECT
value: to the unaided eye[dubious – discuss
type: OTHER
Source sentences:
text: For observers near sea level the difference between this geometrical horizon (which assumes a perfectly flat, infinite ground plane) and the true horizon (which assumes a spherical Earth surface) is imperceptible to the unaided eye[dubious – discuss]