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They prefer, if possible, to deal only with calculable causes, and thus to preserve for their "most perfect of sciences" its special prerogative of assured prediction. Roy. Astr. Astr., vol. ii., p. 168; Astr. Nach. See also Tisserand in Ann. Astr., t. i., p. 506, and Astr. Nach., No. 2,594. Month. Not., February, 1884, p. 187. Harzer's attempt to account for it in Astr. Cf. Chandler, Pop.
Jour., vol. xi. Not., vol. lviii., p. 298; Proc. Roy. Brit. Astr. Phil. Soc. Astr. Roy. Roy. Soc., vol. xxxiv., p. 409. Experiments directed to the same end had been made by Dr. O. Lohse at Potsdam, 1878-80. Astr. Roy. Roy. Astr. Astr. Acad. St. St. Roy. Roy. Soc., vol. xxxix., p. 108; Young, North Am. The new way struck out by Janssen and Lockyer was at once and eagerly followed.
Burton and Green observed a dilatation of the stellar image into a nebulous patch by the transmission of its rays through a nuclear jet of the comet. Am. Cf. Perrine's negative results for Swift's comet in 1899, Astr. Astr. Pac. Not., vol. xlii., p. 14; Am. The transit had been foreseen by Mr. Ges., Jahrg. xxiv., p. 308; Bull. Cf. Not., vols. xxv., xxvi., xxviii. Cf. Astr. Pac. Astr. Pac.
Could the veil be withdrawn, some indications as to the originating temperature of the solar spectrum might be gathered from its range, since the proportion of quick vibrations given out by a glowing body grows with the intensity of its incandescence. Nach., No. 3,053, Amer. Roy. Roy. Annalen, Bd. cxlvi., p. 475; Astr. British Astr. Kön. Böhm Ges. d. Astr. Roy. Roy. Roy. Soc., vol. xxiv., p. 353.
Jahrbuch, 1823, p. 217. Pétersbourg, t. xxxii., No. 3, 1884; Astr. Journ. of Science, vol. i. Prof. Hubbard's calculations indicated a probability that the definitive separation of the two nuclei occurred as early as September 30, 1884. See also, on the subject of this comet, W. T. Lynn, Intellectual Observer, vol. xi., p. 208; E. Ledger, Observatory, August, 1883, p. 244; and H. A. Newton, Am.
Not., vol. xxxviii., p. 473; Trowbridge and Hutchins, Amer. A. L. Cortie, Month. Brit. Astr. Roy. Soc. Roy. Newton was the first who attempted to measure the quantity of heat received by the earth from the sun. His object in making the experiment was to ascertain the temperature encountered by the comet of 1680 at its passage through perihelion.
Journ. of Sc., vol. i., p. 381; also Phil. Jour. Brit. Astr. Roy. Roy. Brit. Astr. Roy. Jour., vol. xxix. Astr. Ass., vol. ii., p. 386; Miss E. Brown, Ibid., p. 210; Month. Roy. Society, vol. lii., p. 307; Rev. W. Sidgreaves, Mem. Baxendell, of Manchester, reached independently a similar conclusion. See Month.
In part, it is certainly due to reflected sunlight; in part, most likely, to the ignition of minute solid particles. Jour. of Sc., vol. xxxviii. Jour. of Sc., vol. xliii. St. Astr. Soc., vol. liii., p. 214; Abelmann, Astr. Roy. St. Astr. Pac. Imp. de St. Pétersbourg, t. xxviii. Roy. R. Soc., vol. xv., p. 5; Month. Roy.
He carried the subject somewhat farther in 1871. R. Soc., vol. xlvi., p. 231; Keeler, Astr. Nach., No. 2,927; Vogel, Astroph. Astr. Pac. Roy. Soc. Astr. Roy. Soc.
Nach., Nos. 1,366, 1,391, 1,689; Chambers, Descriptive Astr. Jour. of Sc., vol. xiv., p. 433; C. Dreyer, Month. Roy. Astr. Pac. Roy. Nach., No. 2,714; Schönfeld, V. J. S. Astr. Roy. Soc., vol. xxxiii., p. 425; Report Brit. Assoc., 1882, p. 444. An impression of the four lower lines in the same spectrum was almost simultaneously obtained by Dr. Draper. Roy. Roy.
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