Assertion: sextant's horizon mirror | /r/HasProperty | half-
Facets:
Source sentences:
text: Traditional sextants have a half-horizon mirror, which divides the field of view in two.
text: Traditional sextants have a half-horizon mirror.
text: Traditional sextants have a half-horizon mirror.
text: Traditional sextants have a half-horizon mirror.
text: Traditional sextants have a half-horizon mirror, dividing the field of view in two (on one side the horizon is observed and on the other side the celestial object is observed).