Arcturus sentence example
It was also called Proarcturia, an indication that it was held before the rising of Arcturus.
The Greeks identified this constellation with the nymph Callisto, placed in the heavens by Zeus in the form of a bear together with her son Arcas as " bear-warder," or Arcturus; they named it Arctos, the she-bear, Helice, from its turning round the pole-star.
Arcturus has been supposed to be referred to in various passages of the Hebrew Bible; the Vulgate reads Arcturus for stars mentioned in Job ix.
This constellation has been known by many other names - Arcas, Arctophylax, Arcturus minor, Bubuleus, Bubulus, Canis latrans, Clamator, Icarus, Lycaon, Philometus, Plaustri custos, Plorans, Thegnis, Vociferator; the Arabs termed it Aramech or Archamech; Hesychius named it Orion; Jules Schiller, St Sylvester; Schickard, Nimrod; and Weigelius, the Three Swedish Crowns.
Of the first magnitude red stars Antares is the most deeply coloured, Betelgeux,.Aldebaran and Arcturus being successively less conspicuously red.Advertisement
Then follows a gradual absorption of first the helium and then the hydrogen, the photosphere grows continually cooler, and the star passes successively through the stages exemplified by Sirius, Procyon, the Sun, Arcturus and Antares.
Jacques Cassini also proved that Arcturus had even since the time of Tycho Brahe shifted five minutes in latitude; for r l Bootis, which would have shared in the change, if it had been due to a motion of the ecliptic, had not moved appreciably.
Probably the velocity of Arcturus is also over 100 m.
It is virtually identical with a group known as the " yellow stars," of which the most prominent examples are Capella, Pollux and Arcturus; this is not the most numerous group, however; more than one half of all the stars whose spectra are known belong to a simpler type in which the metallic lines are faint or absent, excepting hydrogen and sometimes helium, which declare themselves with increased prominence.
The Sumerians and Accadians, the non-Semitic inhabitants of the Euphrates valley prior to the Babylonians, described the stars collectively as a " heavenly flock "; the sun was the " old sheep "; the seven planets were the " old-sheep stars "; the whole of the stars had certain " shepherds, " and Sibzianna (which, according to Sayce and Bosanquet, is the modern Arcturus, the brightest star in the northern sky) was the " star of the shepherds of the heavenly herds."Advertisement
In the same author's Works and Days, a treatise which is a sort of shepherd's calendar, there are distinct references to the Pleiades, Hyades, Orion, Sirius and Arcturus.
To the right of Hercules lie the arc of stars making up Corona Borealis and then Bootes with its bright star Arcturus.
It will be discovered that a solar system revolves around Arcturus and the Pleiades.