Fixed-stars Sentence Examples
At the present day when the nebulae that are spiral in form have been shown to be so numerous, next to the fixed stars themselves, our view of the nebular theory has been somewhat modified.
Among his other papers may be mentioned those dealing with the formation of fairy rings (1807), a synoptic scale of chemical equivalents (1814), sounds inaudible to ordinary ears (1820), the physiology of vision (1824), the apparent direction of the eyes in a portrait (1824) and the comparison of the light of the sun with that of the moon and fixed stars (1829).
His detection of considerable errors in the tables then in use led him to the conclusion that a more accurate ascertainment of the places of the fixed stars was indispensable to the progress of astronomy; and, finding that Flamsteed and Hevelius had already undertaken to catalogue those visible in northern latitudes, he assumed to himself the task of making observations in the southern hemisphere.
Where accurate differential observations or photographs involving other than instantaneous exposures have to be made, the additional condition is required that the optical axis of the telescope shall accurately and automatically follow the object under observation in spite of the apparent diurnal motion of the heavens, or in some cases even of the apparent motion of the object relative to neighbouring fixed stars.
He was also the first advocate of Copernican views in England, and he concluded that the fixed stars are not all at the same distance from the earth.Advertisement
His extant works consist of two treatises; the one, Hcpi ravovj.thv s v4aipas, contains some simple propositions on the motion of the sphere, the other, IIEpi EirtroXWV Kai Sbo €wv, in two books, discusses the rising and setting of the fixed stars.
To prove this, it will be sufficient to mention that an exceedingly small deficiency in the transparency of the free aether would be sufficient to prevent the light of the fixed stars from reaching the earth, since their distances are so immense.
In the case of the greater number of the fixed stars this is so slow that centuries may have to elapse before motion can be deduced.
In the new system, the sphere of the fixed stars no longer revolved diurnally, the earth rotating instead on an axis directed towards the celestial pole.
In ancient astronomy the firmament was the eighth sphere containing the fixed stars surrounding the seven spheres of the planets.Advertisement
The Babylonian priests accordingly applied themselves to the task of perfecting a system of interpretation of the phenomena to be observed in the heavens, and it was natural that the system was extended from the moon, sun and five planets to the more prominent and recognizable fixed stars.
The same observation can be made with the cone of rays of a reflector, and in the same way the fine rain-drops upon a dark background and the fixed stars in the sky become visible.
He showed that in the spectra of the fixed stars many of the dark lines were different from those of the solar spectrum, whilst other wellknown solar lines were wanting; and he concluded that it was not by any action of the terrestrial atmosphere upon the light passing through it that the lines were produced.
Later still the Neoplatonist Emperor Julian wrote in Hymn to Helios that the sun moved in the starless heaven beyond the fixed stars.
Beyond this sublunary world extend the planetary spheres, out to the sphere of the Fixed Stars.Advertisement