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A. D. Vol angle of position aperture apparent Magnitudes appear ascertain atmosphere axis Bode's Jahrbuch Catalogue of Double cause celestial bodies Ceres clusters of stars coloured comet comparative brightness condensed construction Dated distance Double Stars Enceladus equal experiments F. R. S. Read June figure fixed stars Flamsteed's Foot-note given globular globular clusters gradually heavens Herculis illumination inches invisible rays lucid luminous magnifying power magnitude Mars Mayer's measures method micrometer milky moon nebulosity nebulous matter nebulous stars occasion heat orbits paper parallactic motion parallax perihelion periodical star Phil planet Saturn Plate polar power of 460 prism prismatic spectrum probably proper motions radiant heat rays that occasion reflector Refraction Remarks ring rotation rotatory motion satellite of Saturn Shallows sidereal Slough small stars solar motion solar system space space-penetrating power spots supposed Synopsis telescope Tethys tion Trans Uranus velocity Venus visible William Herschel Windsor Writings of—Continued
Page 35 - They now are seen to resemble a luxuriant garden, which contains the greatest variety of productions, in different nourishing beds; and one advantage we may at least reap from it is, that we can, as it were, extend the range of our experience to an immense duration.
Page 61 - The four last experiments prove, that the maximum of the heating power is vested among the invisible rays ; and is probably not less than half an inch beyond the last visible ones, when projected in the manner before mentioned. The same experiments also show, that the sun's invisible rays, in their less refrangible state, and considerably beyond the maximum, still exert a heating power fully equal to that of red-coloured light ; and that, consequently, if we may infer the quantity of the efficient...
Page 59 - It is sometimes of great use in natural philosophy to doubt of things that are commonly taken for granted ; especially as the means of resolving any doubt, when once it is entertained, are often within our reach.
Page 36 - Account of the discovery of a sixth and seventh satellite of the planet Saturn, with remarks on the construction of its ring, its atmosphere, its rotation on an axis, and its spheroidical figure.
Page 30 - If we indulge a fanciful imagination and build worlds of our own, we must not wonder at our going wide from the path of truth and nature; but these will vanish like the Cartesian vortices, that soon gave way when better theories were offered. On the other hand, if we add observation to observation, without attempting to draw not only certain conclusions, but also conjectural views from them, we offend against the very end for which only...
Page 62 - Experiments on the Solar and on the Terrestrial Rays that occasion Heat; with a comparative View of the Laws to which Light and Heat, or rather the Rays which occasion them, are subject, in order to determine whether they are the same or different.
Page 40 - If this matter is self-luminous, it seems more fit to produce a star by its condensation than to depend on the star for its existence.
Page 35 - For, is it not almost the same thing whether we live successively to witness the germination, blooming, foliage, fecundity, fading, withering, and corruption of a plant, or whether a vast number of specimens, selected from every stage through which the plant passes in the course of its existence, be brought at once to our view ? WILLIAM HERSCHEL.