The Practical Astronomer: Comprising illustrations of light and colours--practical descriptions of all kinds of telescopes--the use of the equatorial-transit--circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomyDick, Thomas
Science
The Practical Astronomer: Comprising illustrations of light and colours--practical descriptions of all kinds of telescopes--the use of the equatorial-transit--circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy
Dick, Thomas
Astronomical instruments; Astronomy; Telescopes
The whole of this splendid scene, which light produces, may be
considered as a new creation, no less grand and beneficent than the
first creation, when the command was issued, “Let there be light, and
light was.” The aurora and the rising sun cause the earth and all
the objects which adorn its surface, to arise out of that profound
darkness and apparent desolation which deprived us of the view of them,
as if they had been no more. It may be affirmed, in full accordance
with truth, that the efflux of light in the dawn of the morning, after
a dark and cloudy night, is even more magnificent and exhilarating
than at the first moment of its creation. At that period, there
were no spectators on earth to admire its glorious effects; and no
objects, such as we now behold, to be embellished with its radiance.
The earth was a shapeless chaos, where no beauty or order could be
perceived; the mountains had not reared their heads; the seas were not
collected into their channels; no rivers rolled through the valleys, no
verdure adorned the plains; the atmosphere was not raised on high to
reflect the radiance, and no animated beings existed to diversify and
enliven the scene. But now, when the dawning of the morning scatters
the darkness of the night, it opens to view a scene of beauty and
magnificence. The heavens are adorned with azure, the clouds are tinged
with the most lively colours, the mountains and plains are clothed with
verdure, and the whole of this lower creation stands forth arrayed with
diversified scenes of beneficence and grandeur, while the contemplative
eye looks round and wonders.
Such, then, are the important and beneficent effects of that _light_
which every moment diffuses its blessings around us. It may justly
be considered as one of the most essential substances connected with
the system of the material universe, and which gives efficiency to
all the other principles and arrangements of nature. Hence we are
informed, in the sacred history, that light was the first production
of the Almighty Creator, and the first born of created beings; for
without it the universe would have presented nothing but an immense
blank to all sentient existences. Hence, likewise, the Divine Being
is metaphorically represented under the idea of light, as being the
source of knowledge and felicity to all subordinate intelligences: “God
is _light_, and in Him is no darkness at all;” and he is exhibited as
“dwelling in light unapproachable and full of glory, whom no man hath
seen or can see.” In allusion to these circumstances, Milton, in his
Paradise Lost, introduces the following beautiful apostrophe:--
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