A Popular Grammar of the Elements of Astronomy: Adapted to the Use of Students and Public Schools

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Sherwood and Company, 1836 - 287 pagine
 

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Pagina 115 - I have often seen double and treble nebulae variously arranged ; large ones with small seeming attendants ; narrow, but much extended lucid nebulae or bright dashes ; some of the shape of a fan, resembling an electric brush issuing from a lucid point; others of the cometic shape, with a seeming nucleus in the centre, or like cloudy stars, surrounded with a nebulous atmosphere...
Pagina 36 - ... show that heat is produced by the sun's rays only when they act on a calorific medium: they are the cause of the production of heat, by uniting with the matter of fire which is contained in the substances that are heated...
Pagina 120 - ... in diameter. The star is perfectly in the centre, and the atmosphere is so diluted, faint, and equal throughout, that there can be no surmise of its consisting of stars ; nor can there be a doubt of the evident connection between the atmosphere and the star. Another star not much less in brightness, and in the same field with the above, was perfectly free from any such appearance.
Pagina 130 - From this it follows, that not only our sun, but all the stars we can see with the eye, are deeply immersed in the milky way, and form a component part of it.
Pagina 31 - Day, is the time in which any star appears to revolve from the meridian to the meridian again ; or the time in which the earth makes one complete revolution on its axis, which is 23 hours 56...
Pagina 121 - The end I have had in view, by arranging my observations in the order in which they have been placed, has been to shew, that the above mentioned extremes may be connected by such nearly allied intermediate steps, as will make it highly probable that every succeeding state of the nebulous matter...
Pagina 61 - ... the slower she moves. When the earth is in its perihelion, or nearest the sun, the periodical time of the moon is the greatest. The earth is at its perihelion in winter, and...
Pagina 98 - For if our own solar system be conceived to change its place with respect to absolute space, this might, in process of time, occasion an apparent change in the angular distances of the fixed stars; and in such a case, the places of the nearest stars being more affected than of those that are very remote, their relative positions might seem to alter, though the stars themselves were really immovable. And on the other hand, if our own system be at rest and any of the stars really in motion, this might...
Pagina 115 - are arranged into strata, and run on to a great length, and some of them I have been able to pursue, and to guess pretty well at their form and direction. It is probable enough that they may surround the whole starry sphere of the heavens, not unlike the...

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