The Sun: Ruler, Fire, Light, and Life of the Planetary System |
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Page 23
... supposed to be placed at s ; now while it would be hopeless for an astronomer to attempt to determine the direction of either line E M or E ' M ' in space , without reference to any star , it is quite easy to measure the arcs m s and ...
... supposed to be placed at s ; now while it would be hopeless for an astronomer to attempt to determine the direction of either line E M or E ' M ' in space , without reference to any star , it is quite easy to measure the arcs m s and ...
Page 31
... supposed to be such that this epoch corresponded exactly with the epoch when the observer at E ' recorded the Sun's position . Then if the supposition were correct , the above process would be available . But if E were ten or twelve mi ...
... supposed to be such that this epoch corresponded exactly with the epoch when the observer at E ' recorded the Sun's position . Then if the supposition were correct , the above process would be available . But if E were ten or twelve mi ...
Page 35
... supposed the Earth at rest . the motions both of the Earth and Venus are known , the relative motion of Venus is known , and so the conditions of the problem are as fully ascertained as in the simpler case actually dealt with . We thus ...
... supposed the Earth at rest . the motions both of the Earth and Venus are known , the relative motion of Venus is known , and so the conditions of the problem are as fully ascertained as in the simpler case actually dealt with . We thus ...
Page 38
... supposed to be seen from the Earth's centre ) would be as 1 1 , 2 2 , fig . 13 ( 1 ) , when she is near her FIG . 13 . 4 I II rising node or when both the transits are December ones ; and as 3 3 , 4 4 , fig . 13 ( 1 ) , when she is at a ...
... supposed to be seen from the Earth's centre ) would be as 1 1 , 2 2 , fig . 13 ( 1 ) , when she is near her FIG . 13 . 4 I II rising node or when both the transits are December ones ; and as 3 3 , 4 4 , fig . 13 ( 1 ) , when she is at a ...
Page 48
... supposed that no new results could serve to throw doubt on those de- duced by Encke , until the time should come when Venus would again cross the Sun's face - that is , until the year 1874. But the rapid progress of science during the ...
... supposed that no new results could serve to throw doubt on those de- duced by Encke , until the time should come when Venus would again cross the Sun's face - that is , until the year 1874. But the rapid progress of science during the ...
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Common terms and phrases
angle Ångström aphelion appearance astronomers body bright lines centre chromatosphere clouds coloured consider corona corresponding dark lines deduced determine diameter direction Earth eclipse effect error estimate fact faculæ favourable globe greater Halley's method heat height Herschel hydrogen inferior conjunction ingress length less limb luminous Mars mass matter mean distance measure meteoric miles per second minute Moon Moon's motion noticed observations orbit pass path peculiarity penumbra perihelion phenomena photographs photosphere planets Plate polariscopic portion present prism problem prominences proportion rays recognised regarded regions remarkable researches respecting rotation round Secchi seems seen shown Sir William Herschel slit solar light solar parallax solar physics solar prominences solar spectrum solar spots space spectra spectroscope stars stations Sun can control Sun-spot Sun's disc Sun's distance Sun's surface supposed telescope terrestrial theory tion transit transits of Venus vapours velocity Venus violet visible zodiacal light
Popular passages
Page 451 - I have seen the wild stone-avalanches of the Alps, which smoke and thunder down the declivities with a vehemence almost sufficient to stun the observer. I have also seen snow-flakes descending so softly as not to hurt the fragile spangles of which they were composed ; yet to produce from aqueous vapour a quantity, which a child could carry, of that tender material, demands an exertion of energy competent to gather up the shattered blocks of the largest stone-avalanche I have ever seen, and pitch...
Page 184 - Hence he concludes that the sun has a very extensive atmosphere, which consists of elastic fluids that are more or less lucid and transparent ; and of which the lucid ones furnish us with light. This atmosphere, he...
Page 117 - I obtained a tolerably bright solar spectrum, and brought a flame coloured by sodium vapour in front of the slit. I then saw the dark lines D change into bright ones.
Page 439 - The sun's rays are the ultimate source of almost every motion which takes place on the surface of the earth. By its heat are produced all winds, and those disturbances in the electric equilibrium of the atmosphere which give rise to the phenomena of lightning, and probably also to those of terrestrial magnetism and the aurora.
Page 225 - Looked at in this point of view, we cannot refuse to regard them as organisms of some peculiar and amazing kind ; and though it would be too daring to speak of such organization as partaking of the nature of life, yet we do know that vital action is competent to develop both heat, light, and electricity.
Page 357 - The silvery rays were longest and most prominent at four points of the circumference — two upon the upper, and two upon the lower portion, apparently equidistant from each other . . . giving the spectacle a quadrilateral form. The angles of the quadrangle were about opposite the northeastern, north-western, south-eastern, and south-western points of the disc" (an arrangement corresponding precisely with the observations made at lower levels).
Page 194 - The spots, in this view of the subject, would come to be assimilated to those regions in the earth's surface, in which for the moment hurricanes and tornadoes prevail — the upper stratum being temporarily carried downwards, displacing by its impetus the two strata of luminous matter beneath, (which may be conceived as forming an habitually tranquil limit between the opposite upper and under currents,) the upper of course to a greater extent than the lower, and these wholly or partially denuding...
Page 188 - From experience we can affirm, that the performance of the most salutary offices to inferior planets, is not inconsistent with the dignity of superior purposes ; and, in consequence of such analogical reasonings, assisted by telescopic views, which plainly favour the same opinion, we need not hesitate to admit that the sun is richly stored with inhabitants.
Page 457 - Still, presented rightly to the mind, the discoveries and generalisations of modern science constitute a poem more sublime than has ever yet been addressed to the imagination. The natural philosopher of to-day may dwell amid conceptions which beggar those of Milton.
Page 458 - And still, notwithstanding this enormous drain in the lapse of human history, we are unable to detect a diminution of his store. Measured by our largest terrestrial standards, such a reservoir of power is infinite ; but it is our privilege to rise above these standards, and to regard the sun himself as a speck in infinite extension — a mere drop in the universal sea. We analyse the space in which he is immersed, and which is the vehicle of his power.