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
‘Hail holy light! offspring of heaven first born,
Or of the eternal co-eternal beam!
May I express thee unblam’d? since God is light,
And never but in unapproached light
Dwelt from eternity; dwelt then in thee,
Bright effluence of bright essence increate.
----Before the sun
Before the heavens thou wert, and at the voice
Of God, as with a mantle, did’st invest
The rising world of waters dark and deep
Won from the void and formless infinite.’
As light is an element of so much importance and utility in the
system of nature, so we find that arrangements have been made for its
universal diffusion throughout all the worlds in the universe. The sun
is one of the principal sources of light to this earth on which we
dwell, and to all the other planetary bodies. And, in order that it may
be _equally_ distributed over every portion of the surfaces of these
globes, to suit the exigencies of their inhabitants, they are endowed
with a motion of rotation, by which every part of their surfaces is
alternately turned towards the source of light; and when one hemisphere
is deprived of the direct influence of the solar rays, its inhabitants
derive a portion of light from luminaries in more distant regions, and
have their views directed to other suns and systems dispersed, in
countless numbers, throughout the remote spaces of the universe. Around
several of the planets, satellites, or moons, have been arranged for
the purpose of throwing light on their surfaces in the absence of the
sun, while at the same time the primary planets themselves reflect an
effulgence of light upon their satellites. All the stars which our
unassisted vision can discern in the midnight sky, and the millions
more which the telescope alone enables us to descry, must be considered
as so many fountains of light, not merely to illuminate the voids of
immensity, but to irradiate with their beams surrounding worlds with
which they are more immediately connected, and to diffuse a general
lustre throughout the amplitudes of infinite space. And, therefore,
we have every reason to believe, that, could we fly, for thousands of
years, with the swiftness of a seraph, through the spaces of immensity,
we should never approach a region of absolute darkness, but should find
ourselves, every moment encompassed with the emanations of light, and
cheered with its benign influences. That Almighty Being who inhabiteth
immensity and “dwells in light inaccessible,” evidently appears to
have diffused light over the remotest spaces of his creation, and to
have thrown a radiance upon all the provinces of his wide and eternal
empire, so that every intellectual being, wherever existing, may feel
its beneficent effects, and be enabled, through its agency, to trace
his wonderful operations, and the glorious attributes with which he is
invested.
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