Elements of Astronomy ...: With Explanatory Notes, and Questions for Examination |
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Page viii
... nodes ,. 163 From full moon to the third quarter , 147 From the third quarter to new The line of the apsides , ....... 164 Increased apparent size of the moon when in the zenith , .. 165 moon , 147 The moon always turns the What the ...
... nodes ,. 163 From full moon to the third quarter , 147 From the third quarter to new The line of the apsides , ....... 164 Increased apparent size of the moon when in the zenith , .. 165 moon , 147 The moon always turns the What the ...
Page 145
... 53 . M I moon are shown in Fig . 53 , where E represents the earth and M the moon . What is the extent of the diameter ? MOON'S PHASES . 266. The moon has no light of. RELATIVE SIZES OF THE MOON AND EARTH . LINE OF THE NODES . 13.
... 53 . M I moon are shown in Fig . 53 , where E represents the earth and M the moon . What is the extent of the diameter ? MOON'S PHASES . 266. The moon has no light of. RELATIVE SIZES OF THE MOON AND EARTH . LINE OF THE NODES . 13.
Page 162
... mean ? What is the inclina- tion of the plane of the moon's orbit to that of the ecliptic ? Is this inclination always the same ? What is the extent of the variation ? LINE OF THE NODES . 163 313. THE LINE OF 162 SOLAR SYSTEM .
... mean ? What is the inclina- tion of the plane of the moon's orbit to that of the ecliptic ? Is this inclination always the same ? What is the extent of the variation ? LINE OF THE NODES . 163 313. THE LINE OF 162 SOLAR SYSTEM .
Page 163
... NODES . A line joining these two points , is in both these planes , and is termed the line of the nodes . In Fig . 58 , EO , represents a part of the plane of the earth's orbit , MM the moon's orbit , A and B the moon's nodes , and AB ...
... NODES . A line joining these two points , is in both these planes , and is termed the line of the nodes . In Fig . 58 , EO , represents a part of the plane of the earth's orbit , MM the moon's orbit , A and B the moon's nodes , and AB ...
Page 164
... nodes retrogrades about 3 ′ 10 ′′ daily , and in the course of 18 years 218d . 21h . 22m . 46sec . , it makes the entire circuit of the ecliptic ; so that , at the termination of this period of time , it occupies exactly the same ...
... nodes retrogrades about 3 ′ 10 ′′ daily , and in the course of 18 years 218d . 21h . 22m . 46sec . , it makes the entire circuit of the ecliptic ; so that , at the termination of this period of time , it occupies exactly the same ...
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Common terms and phrases
altitude angular aphelion apogee apparent diameter apparent motion appear apsides ascertained asteroid astronomers atmosphere axis celestial equator celestial sphere centre changes circle circumference comet constellation craters degrees Describe difference direction discovered disk earth earth's orbit equal Explain from figure extent fixed stars globe Grammar heavenly body heavens hemisphere horizon hundred illumined inclination inferior conjunction J. R. Hind Jupiter latitude latter length libration longitude lunar eclipse magnitude Mars mean solar measured Mercury meridian miles moon moon's orbit mountains move nearly nebula nodes observations occur parallax passing penumbra perigee perihelion period planet position precession Prof quarter radius rays refraction respecting revolution revolve right angle right ascension ring rotation satellites Saturn seen shadow sidereal sidereal day solar day solar distance solar eclipse space spectator spots sun's surface synodical month tance telescope tides tion triangle velocity Venus vernal equinox visible west to east zenith
Popular passages
Page 296 - The fourth term is found by multiplying the second and third terms together and dividing by the first § 14O.
Page 24 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 164 - 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.
Page 305 - 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...
Page 24 - A SPHERE is a solid bounded by a curved surface, every part of which is equally distant from a point within, called the centre.
Page 162 - 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.
Page 13 - 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.
Page 50 - ... 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...
Page 51 - 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.
Page 318 - 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...