Annals of the Astronomical Observatory of Harvard College Volume 5

Annals of the Astronomical Observatory of Harvard College Volume 5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1867 edition. Excerpt: ...from /3 downward, can be seen by a glimpse even after long watching. 1863, March 9. /?, p, and r," now and then in sight of usual relative magnitudes; /? barely p and r- = 1863, March 11. Under not good definition, saw the stars of the nebula as follows: " just perceptibly, = r"1, r"4 r"i very decidedly, say 0m.4, r"! p 0m.1, a p 0m.2, tj/ and y about as faint as a. 1863, March 12. No star visible in bright regions except trapezium, yet A"A" is plain, and b"b"i distinguished without difficulty; S, t, and, are all invisible. The effect of the bad vision is to fill up the dark regions with dim diffuse light. 1863, March 16. Small stars of nebula. /3 f 0m.1, r"i p 0m.1. This comparison made in haze, and not to be relied upon. Vision not suitable for the faint stars. 1863, March 17. Looked at faint stars near trapezium; f3 seems, as usual, a very little brighter than p or I do not see that the latter has changed certainly, though I fancied it a little fainter than usual with reference to r"4. 1863, March 18. /?, p, etc., well seen, of usual relative brightness; j3 just perceptibly, = i"v r"i 0m.3, r"4 may be a little p, say 0m.05. 1863, March 19. After 6h 54"5 Sid. time. From atmospheric disturbance /? not always visible, but b"b"! always easily seen. 1863, March 22. /?, f, T"lt r"4, and p, as usual; r"i nearly as bright as /?. Later, ir, i, y, of usual order of brightness. 1863, March 27. Sid. time 7h 8m, was surprised to see j3, f, r"v p, and r"4, all easily, before the form of bright triangles of nebulosity could be clearly made out. 7h 14m, r is easily seen as bright as t; p = b"b"1....show more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236514386
  • 9781236514387