Plane astronomy |
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Page 46
... inferior planets , or those which are between us and the Sun , being very ... planet can never be seen at above a certain angular distance from the Sun ... planet can reach . Owing to the small inclination of the orbit to the ecliptic ...
... inferior planets , or those which are between us and the Sun , being very ... planet can never be seen at above a certain angular distance from the Sun ... planet can reach . Owing to the small inclination of the orbit to the ecliptic ...
Page 47
... inferior planet appears to oscillate backwards and forwards about the Sun , appearing to turn when it has reached its greatest distance on one side , and proceed in the opposite direction till it has reached its greatest distance on the ...
... inferior planet appears to oscillate backwards and forwards about the Sun , appearing to turn when it has reached its greatest distance on one side , and proceed in the opposite direction till it has reached its greatest distance on the ...
Page 48
... inferior and the latter the superior conjunction . At the former , if the planet be sufficiently near the node of its orbit , it passes between the Earth and the Sun. This phenomenon is called a transit . We thus observe that ...
... inferior and the latter the superior conjunction . At the former , if the planet be sufficiently near the node of its orbit , it passes between the Earth and the Sun. This phenomenon is called a transit . We thus observe that ...
Page 49
... planet will not be at its greatest elongation as seen from the Earth , till it has arrived at a farther point b ... inferior planets deriving all their light from the Sun , and therefore being unenlightened in the hemisphere which is turned ...
... planet will not be at its greatest elongation as seen from the Earth , till it has arrived at a farther point b ... inferior planets deriving all their light from the Sun , and therefore being unenlightened in the hemisphere which is turned ...
Page 50
... planet appears crescent - shaped . From b to the next point of greatest ... inferior planets are inclined to that of the Earth . The consequence is ... planet begins to turn and move in the opposite direction are not always the same , the ...
... planet appears crescent - shaped . From b to the next point of greatest ... inferior planets are inclined to that of the Earth . The consequence is ... planet begins to turn and move in the opposite direction are not always the same , the ...
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Common terms and phrases
accurately angular distance antarctic circle apparent direction appear astronomical axis azimuth bisects called celestial equator celestial sphere circle clock coincide conjunction consequently correction curve declination described determined diameter diurnal diurnal motion Earth Earth's centre Earth's orbit Earth's surface eclipse enlightened hemisphere equal equinox error exactly field of view fixed stars greatest heavenly bodies Hence horizon-glass inclination index-glass inferior planet instrument intersection latitude limb line of collimation line of graduation line of nodes longitude lunar lunar eclipse means measured meridian altitude Moon motion nearly object-glass observed angle opposite parallax parallel passing the meridian perigee perpendicular phenomena plane pole position radius reflected image refraction revolution revolves right angle right ascension sea-line seen sextant shew shewn sidereal sidereal day Sidereal period solar solstice space sphere of observation spherical straight line subtended Sun's supposing Synodic period telescope transit true direction velocity vernier wire zenith distance zero
Popular passages
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 14 - 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 23 - the altitude of the pole above the horizon is equal to the latitude of the place. The
Page 2 - 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 7 - of the Earth is inclined to the plane of the orbit at an angle of about 66°
Page 69 - 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.