Assertion: aurora borealis | /r/AtLocation | the sky
Facets:
value: at night
type: TEMPORAL
value: by sun
type: TEMPORAL
Source sentences:
text: Aurora Borealis which is also known as "Northern Lights" because it is seen mainly and clearly in the Northern Hemisphere, is a band of light of red and green, seen in the sky at night or by sun set near the North Pole.
text: An aurora borealis is light seen in the sky, nearly always at night, in the northern hemisphere,