Assertion: maunder minimum | /r/ObjectUse | used for the period
Facets:
value: to 1715
type: TEMPORAL
value: around 1645
type: TEMPORAL
Source sentences:
text: The Maunder Minimum, also known as the "prolonged sunspot minimum", is the name used for the period around 1645 to 1715 during which sunspots became exceedingly rare, as was then noted by solar observers.