Assertion: astronomer's observation | /r/CapableOf | determine gravitational perturbations
Facets:
Source sentences:
text: Early observations of this nature were used to develop very precise orbital models of the various planets, and to determine their respective masses and gravitational perturbations.
text: Early observations of this nature were used to develop very precise orbital models of the various planets, and to determine their respective masses and gravitational perturbations.