Assertion: calcite's crystal | /r/HasProperty | useful
Facets:
value: in mountainous areas
type: LOCATION
value: beyond nautical navigation
type: OTHER
value: as a sundial
type: MANNER
value: in partly overcast conditions
type: TEMPORAL
Source sentences:
text: Beyond nautical navigation, a polarizing crystal would have been useful as a sundial, especially at high latitudes with extended hours of twilight, in mountainous areas, or in partly overcast conditions.