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Updated: May 29, 2025
This magnificent spectacle is sometimes enhanced by a second circle of light enclosing the whole, and the edges of several outer circles springing in faint light therefrom until gradually lost, leaving the imagination to call up the idea of an endless series of glories extending over the whole sky. Refraction frequently causes grotesque as well as wonderful and beautiful appearances.
The mirage had in effect contracted the entire space between us and the train to a pistol-shot in breadth, and had made a background for its horrible picture by lifting into view Heaven knows how great an extent of country below our horizon. Does refraction account for all this?
To find the length of the line N, in proportion to CP, CS, CG, it must be determined by observations of the irregular refraction which occurs in this section of the crystal; and I find thus that the ratio of N to GC is just a little less than 8 to 5.
Green’s remembrance; how they retained sight of the earth till they lost it behind the clouds; and how the reflection of the balloon on the undulating masses of vapour was gorgeously picturesque; together with a little science about the refraction of the sun’s rays, and some mysterious hints respecting atmospheric heat and eddying currents of air.
What we call diffused light on Earth, the grateful result of refraction, the luminous matter held in suspension by the air, the mother of our dawns and our dusks, of our blushing mornings and our dewy eyes, of our shades, our penumbras, our tints and all the other magical effects of chiaro-oscuro this diffused light has absolutely no existence on the surface of the Moon.
Hence, to disturb existing government is, in the sight of God, a heinous offence, unless circumstances plainly justify a revolution; otherwise, one might as well think to interfere with impunity and change the equinoxes, or the laws of refraction.
Halos of this nature are supposed to arise from the double refraction of the rays from the sun as the light passes through thin clouds, or from the transmission of light through particles of ice. It lingers a full quarter of an hour, and then dies away. Does this bode rough weather? Surely the cruel Boreas and the frost will not come suddenly on us after this lovely, mild Christmas!
An illustration familiar to every boy is to be found in the fact that he can see fish at the bottom of a clear stream from a bridge, while from the shore the refraction of the water is such that he can see nothing. From the air the aviator can readily see a submarine at a depth of fifty feet unless the water is unusually rough or turbid. The higher he rises the wider is his sphere of vision.
As she travelled deeper and deeper, it was a wonder to see how far that little ray penetrated down and down through gulfs of darkness, blue and cold like the shimmer of a diamond, and even when it could be seen no more, sent yet a shadowy refraction, a line of something less black than the darkness, a lightening amid the gloom, a something indefinable which was hope.
By the refined experiments of Knoblauch, who worked long and successfully at this question, the double refraction of heat, by Iceland spar, was first demonstrated; but, though he employed the luminous heat of the sun, the observed deflections were exceedingly small.
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