11. In astronomy the horizon is the horizontal plane through the eyes of the observer. 12. Intertidal honeycomb weathering is found on horizontal planes in rock within the tidal zone. 13. S-waves polarized in the horizontal plane are classified as SH-waves. 14. The support polygon is simply the projection of this set on the horizontal plane . 15. A total station can be used for leveling when set to the horizontal plane . 16. The cantilevered floors, horizontal planes , create semi-private zones within. 17. The direction of the incoming wave relative to the horizontal plane may be measured also. 18. Ii ) The hemisphere initially rests on a rough horizontal plane with its base vertical. 19. Its intersections with horizontal planes consists of alternating hyperbolas. 20. The vertical radiation pattern is fan-shaped, reaching approximately 70?of elevation above the horizontal plane .
