Assertion: sextant | /r/HasProperty | octant
Facets:
Source sentences:
text: This time I decided to do a more concrete project: a sextant (actually, an octant).
text: Though they look complicated, the simple idea behind a sextant (or quadrant, octant etc) is just to measure the angle between two things in the sky, either two bodies (like the moon and Regulus), or between one body (Polaris or the sun) and the horizon.