Assertion: comet | /r/HasProperty | designated as great comets
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.
text: About every decade or so, a comet will become bright enough to be noticed by a casual observer—such comets are often designated Great Comets.
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.