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Axis

(Encyclopedia)Axis, coalition of countries headed by Germany, Italy, and Japan, 1936–45 (see World War II). The expression “Rome-Berlin axis” originated in Oct., 1936, with an accord reached by Hitler and Mus...

Cartesian coordinates

(Encyclopedia)CE5 Cartesian coordinates Cartesian coordinates kärtēˈzhən [key] [for René Descartes], system for representing the relative positions of points in a plane or in space. In a plane, the point P...

gyroscope

(Encyclopedia)CE5 Three-frame gyroscope gyroscope jīˈrəskōpˌ [key], symmetrical mass, usually a wheel, mounted so that it can spin about an axis in any direction. When spinning, the gyroscope has special p...

ellipse

(Encyclopedia)CE5 Ellipse ellipse, closed plane curve consisting of all points for which the sum of the distances between a point on the curve and two fixed points (foci) is the same. It is the conic section fo...

Anti-Comintern Pact

(Encyclopedia)Anti-Comintern Pact: see Comintern and Axis. ...

hyperbola

(Encyclopedia)CE5 Hyperbola hyperbola hīpûrˈbələ [key], plane curve consisting of all points such that the difference between the distances from any point on the curve to two fixed points (foci) is the sam...

South Pole

(Encyclopedia)South Pole, southern end of the earth's axis, by convention at lat. 90° S. Because the earth's rotational axis wobbles slightly over time, the location where the southern end of the axis intersects t...

parabola

(Encyclopedia)CE5 Parabola parabola pərăbˈələ [key], plane curve consisting of all points equidistant from a given fixed point (focus) and a given fixed line (directrix) (see illustration). It is the conic...

quadrant, in analytic geometry

(Encyclopedia)quadrant. 1 In analytic geometry, one of the four regions of the plane determined by two lines, the x-axis and the y-axis. Commonly these lines are drawn perpendicular to each other, and the quadrants...

astronomical coordinate systems

(Encyclopedia)astronomical coordinate systems. A coordinate system is a method of indicating positions. Each coordinate is a quantity measured from some starting point along some line or curve, called a coordinate ...