Assertion: aurora borealis | /r/AtLocation | the night sky
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: The Aurora Borealis , or the northern lights, is a natural luminous light phenomenon that is commonly observed in the night sky at polar and sub-polar latitudes, and less commonly in other latitudes of the northern hemisphere.
text: Aurora Borealis is a bright glow observed in the night sky, usually in the polar zone.
text: Aurora Borealis is a bright glow observed in the night sky, usually in the polar zone.
text: northern Lights or aurora borealis are natural different colored light displays, which are usually observed in the night sky, particularly in the polar zone.