Assertion: telescope's aperture | /r/HasProperty | useful gauge
Facets:
value: the
type: DEGREE
value: historically
type: TEMPORAL
Source sentences:
text: This list is ordered by optical aperture, which has historically been a useful gauge of limiting resolution, optical area, physical size, and cost.
text: So in general, the bigger the aperture (the diameter of the objective lens or primary mirror) the more useful the scope.