moves 180 degrees
12Gear — For the gear like device used to drive a roller chain, see Sprocket. This article is about mechanical gears. For other uses, see Gear (disambiguation). Two meshing gears transmitting rotational motion. Note that the smaller gear is rotating… …
13Line dance — A line dance is choreographed dance with a repeated sequence of steps in which a group of people dance in one or more lines (British English, rows ) without regard for the gender of the individuals, all facing the same direction, and executing… …
14Polygon — For other uses, see Polygon (disambiguation). Some polygons of different kinds In geometry a polygon (   …
15Roller coaster elements — Contents 1 Basic elements 1.1 Brake run 1.2 Buzz bars 1.3 …
16Charts on SO(3) — In mathematics, the special orthogonal group in three dimensions, otherwise known as the rotation group SO(3), is a naturally occurring example of a manifold. The various charts on SO(3) set up rival coordinate systems: in this case there cannot… …
17surveying — /seuhr vay ing/, n. 1. the science or scientific method of making surveys of land. 2. the occupation of one who makes land surveys. 3. the act of one who surveys: The surveying required nearly two days. [1425 75; late ME: act of examining… …
18Aberration of light — Light from location 1 will appear to be coming from location 2 for a moving telescope due to the finite speed of light, a phenomenon known as the aberration of light. The aberration of light (also referred to as astronomical aberration or stellar …
19Professional wrestling holds — include a number of set moves and pins used by performers to immobilize their opponents or lead to a submission. This article covers the various pins, stretches and transition holds used in the ring. Moves are listed under general categories… …
20VHF omnidirectional range — This article is about the radio navigation aid. For other uses, see Vor. D VOR (Doppler VOR) ground station, co located with DME …
