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Elements of Astronomy With Explanatory Notes, and Questions for Examination ...
Anteprima non disponibile - 2017
according altitude amount angle angular appear ascertained astronomers axis body called cause celestial centre changes circle circumference comet course declination describe determined diameter difference direction discovered distance earth east eclipse entire equal equator exist Explain extent fact figure fixed force four Give globe greater half heavenly body heavens height hemisphere horizon hundred illumination illustrated inclination Latin latitude latter length less light lunar magnitude manner mean measured meridian miles minutes months moon moon's motion mountains move nearly night observations obtained occur opposite orbit parallax passing path perihelion period plane pole portion position present Prof proved refraction regard represents respecting revolve right ascension ring rotation round seen shadow side situated solar solstice space sphere star sun's supposed surface telescope termed tides tion true vernal equinox visible winter zenith
Pagina 294 - The fourth term is found by multiplying the second and third terms together and dividing by the first § 14O.
Pagina 162 - These phenomena do not, however, occur at every new and full moon ; and the reason is, that the plane of the moon's orbit is inclined to that of the ecliptic, and that these two planes' meet one another only in their line of common section, which passes through the centre of the earth.
Pagina 303 - On a careful re-examination of the heavens, too, and a comparison of catalogues, many stars are now found to be missing-; and although there is no doubt that these losses have often arisen from mistaken entries, yet in many instances it is equally certain that there is no mistake in the observation or entry, and that the star has really been observed, and as really has disappeared from the heavens...
Pagina 22 - A SPHERE is a solid bounded by a curved surface, every part of which is equally distant from a point within, called the centre.
Pagina 160 - In some of the principal ones, decisive marks of volcanic stratification, arising from successive deposits of ejected matter, and evident indications of Lava currents streaming outwards in all directions, may be clearly traced with powerful telescopes.
Pagina 11 - Dodd, I find it greatly superior to all others which have come under my notice, in system, completeness, and nomenclature. The arrangement is natural, the system complete, and the nomenclature greatly improved. These improvements are not slight; they are fundamental— eminently worthy the attention of the mathematical teacher, and give a character of unity to the work which at once distinguishes it from all others on this subject.
Pagina 48 - ... the sun. More Accurate Computations. — A more accurate determination of the phases as visible at any point of the earth's surface may be obtained from the Besselian elements which are given for every ten minutes of Greenwich mean time. Their geometric signification is as follows: — Let us imagine a plane passing through the centre of the earth, perpendicular to the right line joining the centres of the sun and moon. This latter line is the axis of the moon's shadow, and the plane is called...
Pagina 49 - Circles are great circles passing through the zenith of an observer, and perpendicular to his horizon. The vertical circle passing through the east and west points of the horizon is called the Prime Vertical ” that passing through the north and south points coincides with the celestial meridian.
Pagina 316 - This is an irresolvable nebula, figured by Sir John Herschel, during his residence at the Cape of Good Hope. Its favourable position, as seen in southern latitudes, enabled Herschel to trace the outline of the nebula much farther than any preceding observer had done. The singular figure of this object seems to suggest some power of attraction operating on the particles of matter, or the...