The description and use of the globes and the orrery: To which is prefix'd, by way of introduction, a brief account of the solar systemHarris, Joseph
History
The description and use of the globes and the orrery: To which is prefix'd, by way of introduction, a brief account of the solar system
Harris, Joseph
Astronomical models; Globes
The constellations noted by the ancients on the South side of the
_Zodiac_, were fifteen, _viz._ the _Whale_; the river _Eridanus_;
the _Hare_; _Orion_; the _Great Dog_; _Little Dog_; the Ship _Argo_;
_Hydra_; the _Centaur_; the _Cup_; the _Crow_; the _Wolf_; the
_Altar_; the _Southern Crown_; and the _Southern Fish_. To these have
been lately added the following, _viz._ The _Phœnix_; the _Crane_;
the _Peacock_; the _Indian_; the _Bird of Paradise_; the _Southern
Triangle_; the _Fly_; _Cameleon_; the _Flying Fish_; _Toucan_, or
the _American Goose_; the _Water Serpent_, and the _Sword Fish_. The
ancients placed those particular constellations or figures in the
Heavens, either to commemorate the deeds of some great man, or some
notable exploit or action; or else took them from the fables of their
religion, _&c_. And the modern astronomers do still retain them, to
avoid the confusion that would arise by making new ones, when they
compare the modern observations with the old ones.
[Sidenote: _Unformed Stars._]
Some of the principal Stars have particular names given them, as
_Syrius_, _Arcturus_, _&c._ There are also several Stars that are not
reduced into constellations, and these are called _Unformed Stars_.
[Sidenote: The _Galaxy_, or _Milky Way_.]
Besides the Stars visible to the naked eye, there is a very remarkable
space in the Heavens, called the _Galaxy_, or _Milky Way_. This is a
broad circle of a whitish hue, like milk, going quite round the whole
Heavens, and consisting of an infinite number of small Stars, visible
thro’ a telescope, tho’ not discernable by the naked eye, by reason
of their exceeding faintness; yet with their light they combine to
illustrate that part of the Heavens where they are, and to cause that
shining whiteness.
The places of the fixed Stars, or their relative situations one from
another, have been carefully observed by astronomers, and digested into
catalogues. The first among the _Greeks_, who reduced the Stars into
a catalogue, was _Hypparchus_, who, from his own observations, and of
those who lived before him, inserted 1022 Stars into his catalogue,
about 120 years before the Christian _Æra_: This catalogue has been
since enlarged and improved by several learned men, to the number of
3000, of which there are a great many telescopical, and not to be
discerned by the naked eye; and these are all ranked in the catalogue
as the Stars of the seventh magnitude.
It may seem strange to some, that there are no more than this number
of Stars visible to the naked eye; for sometimes in a clear night
they seem to be innumerable: but this is only a deception of our
sight, arising from their vehement sparkling, while we look upon them
confusedly, without reducing them into any order; for there can seldom
be seen above 1000 Stars in the whole Heavens with the naked eye at the
same time; and if we should distinctly view them, we shall not find
many but what are inserted upon a good _Celestial_ Globe.
Public-domain text, read in full here on John Shaqi.
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