Assertion: eyepiece's diameter | /r/HasProperty | planetary
Facets:
Source sentences:
text: Astrometric reticle eyepieces can be used to measure double star angular separations, position angles, planetary diameters, and lunar crater diameters, as well as many other useful astronomical measurements.
text: Astrometric reticle eyepieces can be used to measure double star angular separations, position angles, planetary diameters, and lunar crater diameters, as well as many other useful astronomical measurements.