Assertion: sun's amount | /r/CapableOf | vary in recent past
Facets:
value: by about 1 w/m2
type: OTHER
Source sentences:
text: Space-based measurements, begun in 1978, indicate Earth receives an average of 1,361 W/m2 of incoming sunlight, an amount that has varied in the recent past by about 1 W/m2 (or one-tenth of one percent) on roughly 11-year cycles.