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
Let us now consider for a moment, what would be the aspect of nature,
if, instead of the beautiful variety of embellishments which now
appear on every landscape, and on the concave of the sky,--_one_
uniform colour had been thrown over the scenery of the universe. Let
us conceive the whole of terrestrial nature to be covered with snow,
so that not an object on earth should appear with any other hue, and
that the vast expanse of the firmament presented precisely the same
uniform aspect. What would be the consequence? The light of the sun
would be strongly reflected from all the objects within the bounds of
our horizon, and would produce a lustre which would dazzle every eye.
The day would acquire a greater _brightness_ than it now exhibits,
and our eyes might, after some time, be enabled freely to expatiate
over the surrounding landscape; but every thing, though enlightened,
would appear _confused_, and particular objects would scarcely be
distinguishable. A tree, a house or a church, near at hand, might
possibly be distinguished, on account of its elevation above the
general surface of the ground, and the bed of a river by reason of its
being depressed below it. But we should be obliged rather to guess,
and to form a conjecture as to the particular object we wished to
distinguish, than to arrive at any certain conclusion respecting it;
and if it lay at a considerable distance, it would be impossible, with
any degree of probability, to discriminate any one object from another.
Notwithstanding the universal brightness of the scene, the uniformity
of colour thrown on every object, would most certainly prevent us from
distinguishing a church from a palace, a cottage from a knoll or a
heap of rubbish, a splendid mansion from rugged rocks, the trees from
the hills on which they grow, or a barren desert from rich and fertile
plains. In such a case, human beings would be confounded, and even
friends and neighbours be at a loss to recognize one another.
Public-domain text, read in full here on John Shaqi.
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