Statements (13)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:astronomer
|
| gptkbp:defines |
period when the sun does not rise above the horizon and civil twilight does not occur
|
| gptkbp:duration |
up to several weeks
|
| gptkbp:occurredIn |
polar regions
|
| gptkbp:occurs_north_of |
latitude 72°34′ N
|
| gptkbp:occurs_south_of |
latitude 72°34′ S
|
| gptkbp:relatedTo |
gptkb:polar_night
gptkb:astronomical_polar_night gptkb:nautical_polar_night |
| gptkbp:sun_altitude |
always below -6°
|
| gptkbp:bfsParent |
gptkb:Polar_night
|
| gptkbp:bfsLayer |
7
|
| https://www.w3.org/2000/01/rdf-schema#label |
civil polar night
|