Assertion: star's orbit | /r/HasProperty | elliptical
Facets:
Source sentences:
text: He also believed that the orbits of planets are elliptical.
text: First, he found that the orbits of the planets in our Solar System are elliptical, not circular (or epicyclic), as had previously been believed, and that the Sun is not located at the center of the orbits, but rather at one focus.