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accurately adjustment angular distance antarctic circle apogee appear astronomical axis called celestial equator celestial sphere clock coincide conjunction Consequently correction curve declination described determined diameter direction diurnal motion Earth Earth's centre Earth's orbit Earth's surface eclipse enlightened hemisphere equal equinox error exactly field of view fixed stars greater greatest heavenly bodies Hence horizon horizon-glass inclination index-glass inferior planet instrument intersection latitude light limb line of collimation line of graduation line of nodes longitude lunar lunar eclipse means measured meridian altitude Moon Moon's move Mural Circle nearly object-glass opposite parallax parallel passed the meridian perigee perpendicular phenomena plane point of Aries pole position radius reading revolution revolves right angles right ascension seen sextant shadow shew shewn sidereal sidereal day sidereal period solar solstice space sphere of observation subtended Sun's supposing synodic period telescope transit velocity vernier vertical visible wire zenith zero
Page 6 - A sphere is a surface every point of which is equally distant from a point within it,
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.