astronomical polar night

GPTKB entity

Statements (12)
Predicate Object
gptkbp:instanceOf polar night
gptkbp:duration_depends_on latitude
https://www.w3.org/2000/01/rdf-schema#label astronomical polar night
gptkbp:is_darker_than gptkb:civil_polar_night
gptkb:nautical_polar_night
gptkbp:occurredIn winter
polar regions
the Sun is more than 18 degrees below the horizon for 24 hours
gptkbp:Sun_does_not_rise_above astronomical twilight
gptkbp:type night
gptkbp:bfsParent gptkb:Polar_night
gptkbp:bfsLayer 7