The Heavens Above: A Popular Handbook of Astronomy

Джозеф Ентоні Жилле The Heavens Above: A Popular Handbook of Astronomy
ISBN:
2000000001181
Мова:
англійська
Рік видання:
2019 р.
Видавництво:
Project Gutenberg
Автор:
Джозеф Ентоні Жилле
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Опис:

I. The Sphere.—A sphere is a solid figure bounded by a surface which curves equally in all directions at every point. The rate at which the surface curves is called the curvature of the sphere. The smaller the sphere, the greater is its curvature. Every point on the surface of a sphere is equally distant from a point within, called the centre of the sphere. The circumference of a sphere is the distance around its centre. The diameter of a sphere is the distance through its centre. The radius of a sphere is the distance from the surface to the centre. The surfaces of two spheres are to each other as the squares of their radii or diameters; and the volumes of two spheres are to each other as the cubes of their radii or diameters.

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