Assertion: sun's orbit | /r/HasProperty | useful
Facets:
value: for spy
type: PURPOSE
value: for weather satellites
type: TRANSITIVE-OBJECT
value: for imaging
type: PURPOSE
Source sentences:
text: A Sun-synchronous orbit is useful for imaging, spy, and weather satellites, because every time that the satellite is overhead, the surface illumination angle on the planet underneath it will be nearly the same.