The DESCRIPTION and USE ofthe CELESTIAL and TER-RESTRIAL GLOBES.

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§BM Glohe or Sphere is a round solid s iH reW .Body, having every Part of itsN Surface equally distant from aPoint within it, called its Cen-ter j and it may he conceivedto be formed by the Revolution of a Semi-circle round its Diameter.

Any Circle pasting through the Centerof the Sphere, thereby dividing into twoequal Parts or Segments, is called a Great ch-.

Circle ; and the Segments of the Sphere so"'

I divided are called Hemispheres. Hem;.

Every Great Circle has its Poles and Axis Jt he re S .

The Poles of a Great Circle, are two Poles.Points on the Surface of the Sphere diame-trically opposite to one another, and everywhere equally distant from the said Circle.

The Axis of a Circle is a right Line ^,7.passing through the Center of the Sphere,and through the Poles of the said Circle ;and is therefore perpendicular to the Planethereof.

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