Assertion: sun's cycle | /r/CapableOf | give average length of 11.04 years
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Source sentences:
text: Until 2009, it was thought that 28 cycles had spanned the 309 years between 1699 and 2008, giving an average length of 11.04 years, but research then showed that the longest of these (1784–1799) may actually have been two cycles.