Assertion: mercury's transit | /r/AtLocation | cycles of 243 years
Facets:
value: with the current pattern of transits
type: OTHER
value: a pattern first discovered
type: OTHER
Source sentences:
text: Transits of Venus occur in cycles of 243 years with the current pattern of transits being pairs of transits separated by eight years, at intervals of about 105.5 years or 121.5 years—a pattern first discovered in 1639 by the English astronomer Jeremiah Horrocks.