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sundial

(Encyclopedia)sundial, instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall. Although any object whose sha...

Zagreb

(Encyclopedia)Zagreb zäˈgrĕb [key], Ger. Agram, Hung. Zágráb, city (2011 pop. 790,017), capital and largest city of Croatia, on the Sava River. Zagreb is Croatia's largest industrial, manufacturing, and financ...

trigonometry

(Encyclopedia)trigonometry [Gr.,=measurement of triangles], a specialized area of geometry concerned with the properties of and relations among the parts of a triangle. Spherical trigonometry is concerned with the ...

number

(Encyclopedia)number, entity describing the magnitude or position of a mathematical object or extensions of these concepts. A real or complex number z is called algebraic if it is the root of a polynomial equati...

symmetry

(Encyclopedia)symmetry, generally speaking, a balance or correspondence between various parts of an object; the term symmetry is used both in the arts and in the sciences. In art and design, it is often used in a s...

seasons

(Encyclopedia)CE5 The seasons are caused by the tilt of the earth's axis to the plane of its orbit about the sun. The Northern Hemisphere is tilted toward the sun in the summer and receives more direct rays than...

map projection

(Encyclopedia)map projection, transfer of the features of the surface of the earth or another spherical body onto a flat sheet of paper. Only a globe can represent accurately the shape, orientation, and relative ar...

circle

(Encyclopedia)CE5 Circle circle, closed plane curve consisting of all points at a given distance from some fixed point, called the center. A circle is a conic section cut by a plane perpendicular to the axis of...

Teilhard de Chardin, Pierre

(Encyclopedia)Teilhard de Chardin, Pierre pyĕr tāyärˈ də shärdăNˈ [key], 1881–1955, French paleontologist and philosopher. He entered (1899) the Jesuit order, was ordained (1911), and received a doctorate...

Mussolini, Benito

(Encyclopedia)Mussolini, Benito bānēˈtō mo͞os-sōlēˈnē [key], 1883–1945, Italian dictator and leader of the Fascist movement. Mussolini was at first cool to Adolf Hitler and opposed his designs on Aus...