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Nach., No. 263 ; Pop. There is also a "parallactic" libration, depending on the earth's rotation; and a species of nodding movement the "libration in latitude" is produced by the inclination of the moon's axis to her orbit, and by her changes of position with regard to the terrestrial equator. Leo Brenner, Naturwiss. Wochenschrift, January 13, 1895; Jour. Brit. Astr.
A group of four asteroids has lately been found, with a mean distance and period equal to that of Jupiter. To three of these masculine names have been given Hector, Patroclus, Achilles; the other has not yet been named. Astr. Nach., 2,944. Acad. des Sc., Paris; C.R., lxxxiii., 1876. Mem. Spettr. Ital., xi., p. 28. R. S. Phil. Trans., No. 1. Grant's Hist. Ph. Ast., p. 267.
D. Cassini, however, first put forward about 1671 the hypothesis alluded to in the text. See Delambre, Hist. de l'Astr. Berl. Ges. Cf. Grant, Astr. Nach., No. 1838. Ency., art. Am. Phil. Trans., vol. xxxviii., p. 134. It. Am. Phil. R. A. S., vol. xxi., pp. 54, 56. Santini had made a similar observation at Padua in 1842. Grant, Hist.
Astr. Pac. Am. Roy. Astr. Pac. Nach., Nos. 2,995, 3,206; Month. Not., vols. li., p. 556; liv., p. 134. Barnard remains convinced that the oval forms attributed to Jupiter's satellites are illusory effects of their markings. Astr. Astr. Pac. Astr. Pac. Ac. Roy. Soc. Astr. Pac. Soc., vol. ii., p. 77; Noble, Month. Astr. Pac. Astr. Pac. Sächs. Jour. E. Anding, Astr. Imp.
Nach., Bände xlvii., p. 1; xlviii., p. 1; xlix., p. 81. Pickering, Mem. Am. Astr. Pac. Brit. Astr. Bayer. Papers for the Amer. Some of the measures were made by Messrs. Astr. Pac. Astr. Pac. Astr. Pac. Not., vol. li., pp. 40, 97. Roy. Roy.
The previously admitted velocity was 308 million metres per second; Foucault reduced it to 298 million. Combined with Struve's "constant of aberration" this gave 8.86" for the solar parallax, which exactly agreed with Cornu's result from a repetition of Fizeau's experiments in 1872. Roy. Astr. Johann Hieronymus Schröter was the Herschel of Germany.
With the forty-foot, however, only very moderate powers seemed to have been employed, whence Dr. Robinson argued a deficiency of defining power. Proc. Roy. Robinson, Proc. Roy. Ass., 1843, Dr. Robinson's closing Address. Phil. Roy. Ir. Before 1850 a star was visible in each of the two larger openings by which it is pierced; since then, one only. Am. Ac., vol. iii., p. 87; Astr.
Imp. de St. Pétersbourg, t. vi., col. 77. Von Dr. Nach., No. 3,267; Observatory, vol. xviii., p. 64; F. H. Seares, Astr. Corr., vol. xxv., pp. 3-22. Reprinted by Zöllner. See Bull. R. A. S., vol. x., p. 376. Rosenberger calculated no more, though he lived until 1890. Month. Report. Brit. Imp. de St. Stars seen through the tail, October 18, lost much of their lustre.
Ait enim terrarum orbem aqua sustineri." Seneca, Nat. Quoest., iii. 13. This notion is mentioned in Schol. Iliad, xiii. 125. This doctrine Thales brought from Egypt. See Plut., Pac., in. 10; Galen, c. 21. But this maybe doubted. Callimach., Frag., 94; Hygin, Poet. Astr., ii. 2; Martin, Timee de Platon., tom. ii. p. 109, thinks it questionable whether Thales saw Egypt. Diog. Laert., viii. 60.
The agreement in them between the positions determined, on separate grounds, for the ultra-Neptunian traveller was merely an odd coincidence; nor can we be certain, until it is seen, that we have really got into touch with it. Jour. of Science, vol. x., p. 185; Maunder, Sunday Mag., January, February, March, 1882; Campbell, Publ. Astr. Pac. Roy. Not., vol. xxvii., p. 179; Astroph. Astr. Pac.
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