The heavens [tr. by W. Lockyer] ed. by J.N. Lockyer |
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The Heavens [Tr. by W. Lockyer] Ed. by J.N. Lockyer Amedee Victor Guillemin Engin sýnishorn í boði - 2015 |
The Heavens [Tr. by W. Lockyer] Ed. by J.N. Lockyer Amedee Victor Guillemin Engin sýnishorn í boði - 2018 |
Common terms and phrases
aphelion appearance Arago astronomers atmosphere axis brightness brilliant celestial bodies celestial vault centre clouds colour comets constellation craters dark described diameter dimensions direction disappear disk double stars Earth elongated equator equinoxes extreme fact globe heat heavens hemisphere Herschel horizon hypothesis illuminated immense intensity Jupiter Lastly length less light luminous luminous points lunar Mädler magnitude Mars mass mean distance measure Mercury meteors miles Milky Moon Moon's movement of rotation naked eye nearly nebula night nucleus observed orbit pass penumbra perihelion period phenomena photosphere physical constitution planet planetary poles portion position present proper motion rays regions remarkable revolution ring round the Sun satellites Saturn seen sidereal sidereal day solar days Solar System sometimes southern space spectrum sphere spots starry vault stars visible Sun's surface telescope terrestrial total eclipse traverse umbra Uranus variable variable stars varies velocity Venus whilst Zodiacal Light zone
Vinsælir kaflar
Síða 86 - Astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in a year. An imaginary Sun, called the mean Sun...
Síða 29 - ... 1000 to 4000 miles broad. By the frequent meeting of the bright ridges, spaces of the Sun's surface are included of various magnitudes and forms, somewhat corresponding to the areas and forms of the irregular spots with penumbrae.
Síða 174 - It follows that in the course of a year Mars presents its various regions to the Sun, nearly like our globe, so that the length of the days and the nights, in the different latitudes, is distributed in the same manner. The extreme zones, tomd and frigid, are a little more extended, proportionally, which consequently reduces the surface of the temperate zones.
Síða 223 - We see it as Columbus saw America from the shores of Spain. Its movements have been felt, trembling along the far-reaching line of our analysis, with a certainty hardly inferior to that of ocular demonstration.
Síða 162 - ... the most remote condition, of which we have positive evidence, was that of small, detached, melted globules, the formation of which cannot be explained in a satisfactory manner, except by supposing that their constituents were originally in the state of vapour, as they now exist in the atmosphere of the Sun ; and, on the temperature becoming lower, condensed into these
Síða 131 - Beyond the second ridge a talus slopes gradually down north ward» to the general level of the lunar surface, the whole presenting an appearance reminding the observer of the concentric moraines of the Rhone glacier. These ridges are visible for the whole period during which that portion of the moon's surface is illuminated, but it is only about the third day after the first quarter and at the corresponding phase of the waning moon (when the sun's rays falling nearly horizontally, throw the details...
Síða 131 - ... and streaks of the lunar surface, are not improbably due to former glacial action. Notwithstanding the excellent definition of modern telescopes, it could not be expected that other than the most gigantic of the characteristic details of an ancient glacier bed would be rendered visible.
Síða 176 - D' Arrest, deduced from this circumstance the evident proof of a common origin. ' One fact,' he says, ' seems above all to confirm the idea of an intimate relation between all the minor planets ; it is, that, if their orbits are figured under the form of material rings, these rings will be found so entangled, that it would be possible, by means of one among them taken at hazard, to lift up all the rest.
Síða 42 - ... the observation commenced, about half-past eleven on the date given, the tongue of facula was extremely brilliant ; by one o'clock, it had become apparently less brilliant than any portion of the penumbra. At the same time it seemed to be ' giving out,' at its end, and a portion of the umbra between it and the penumbra appeared to be veiled with a stratus cloud evolved out of it. After a time, condensation seemed going on on the following portion of the cloudy mass. So that a very brilliant mass...
Síða 153 - ... the phases of the eclipse are reproduced in an inverse order, until the entire emersion of the Moon. The Moon, therefore, does not always completely disappear in total eclipses. The cause of this fact lies in the refraction of the solar rays in traversing the lower strata of the Earth's atmosphere ; they are diverted, and purple our Moon with the tints of sunset. It sometimes happens, however, that the Moon becomes quite invisible during a total eclipse ; as examples of this we may quote the...