Plane astronomy

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Page 6 - A sphere is a surface every point of which is equally distant from a point within it,
Page 6 - (1). Every section of a sphere made by a plane is a circle. Let
Page 18 - between the tropic of Cancer and the arctic circle, and between the tropic of Capricorn and the antarctic circle, are called respectively the
Page 3 - varies directly as the mass of the attracting body and inversely as the square of its distance from the attracted body.
Page 35 - the altitude of the pole above the horizon is equal to the latitude of the place. The
Page v - planet is attracted to the sun by a force varying inversely as the square of the distance from the sun.
Page 7 - When the cutting plane passes through the centre of the sphere, the section is called a great circle.
Page 7 - The diameter of the sphere which is perpendicular to the plane of any
Page 11 - of the Earth is inclined to the plane of the orbit at an angle of about 66
Page 85 - passes through the centre of the horizon-glass, meeting its surface at the same angle as the line drawn from the same point to the centre of the index-glass. Hence a ray of light reflected from the centre of the index-glass to that of the horizon-glass is again reflected along the line of collimation of the telescope.

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