vertical circle การใช้

Some instruments have additional graduations on a vertical circle to assist with these inclined measurements.
The vertical circle measures the angle that the telescope makes against the vertical, known as the zenith angle.
It's measured clockwise around the horizon from the north, or south, to the object or the object's vertical circle with the horizon.
For several minutes, groups of 2 20 birds simultaneously and repeatedly fly around one another in large, vertical circles, while swinging the tail streamers from side to side.
In most circumstances, the hands do not move beyond the vertical circle that is described by swinging the arms in front, with the hands crossed at the wrists.