The wonders of the heavens, being a popular view of astronomy, including a full illustration of the mechanism of the heavens; embracing the sun, moon, and stars, with descriptions of the planets, comets, fixed stars, double stars, the constellations, the galaxy, or milky-way, the zodiacal light, aurora borealis, or norhtern lights, meteors, clouds, falling stars, aërolites, &c (1837)
Bradford, Duncan. [from old catalog] · Boston, American stationers company · leaf 383
ns centre, a crown of forty-fourdegrees in diameter will be visible. The refrac-tion of the violet ray being greater than the red,we shall have for this ray a greater crown. Thesuns diameter, being thirty minutes, will increasethe breadth of the colored bands. Dr. Forster, in a paper read before… … noticed a double refraction of the above form andrelative position; that is, two distinct crescents instead of one, and so precisely similar that itcould not be distinguished which was the parase-lene or mock-moon, and which the true. Forsterthought this phenomenon analogous to the doublerefraction…
Astronomy
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