Great circles of the sphere intercepting each other in the zenith and nadir, and cutting the horizon at right angles.
, great, lesser, azimuth, vertical (which see). ...
The Sailor's Word-Book
·noun Vertical position; zenith. II. Vertical ·noun A vertical line, plane, or circle. III. Vertic...
Webster's Dictionary of the English Language
See vertical circles. ...
The Arctic and the Antarctic; 23° 28′ from either pole. ...
That great circle which passes through the zenith and the east and west points of the horizon. ...
Opposite angles made by two lines cutting or crossing each other, and are always equal. (See angle o...
In artillery, that directed upward at such an angle as that it will fall vertically, or nearly so, t...
The centre of displacement is also that of the centre of vertical force that the water exerts to sup...
See orthographic projection. ...
These are great circles passing through the poles of the ecliptic, and so cutting it at right angles...
The difference between the geographical and geocentric latitudes of a place upon the earth's surface...