Assertion: astronomer's study | /r/HasSubevent | accurate predictions
Facets:
value: during the 18–19th centuries
type: TEMPORAL
Source sentences:
text: During the 18–19th centuries, the study of the three-body problem by Leonhard Euler, Alexis Claude Clairaut, and Jean le Rond d'Alembert led to more accurate predictions about the motions of the Moon and planets.