Astronomical Observations Made at the Observatory of Cambridge Volume 21

Astronomical Observations Made at the Observatory of Cambridge Volume 21

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...to the state of the weather and the painful position of the observer. The comparisons with Redhill 1251 and 1258 were made with Sector fixed; and those with Radcliffe 2166 with the Sector, the wire being placed in the middle of the field, The Comet was brighter than on Aug. 7, but little altered in shape. The Moon was very bright, but I thought I could trace a tail in the Finder. Aug. 18. The Sector was altered between the 5th and 6th comparison. Comet very bright--tail plainly visible to the naked eye. Aug. 19. Comet brighter again to-night--tail longer and more plainly visible to the naked eye--nucleus remarkably changed. Drawings were made on this and preceding nights by Professor Challis. Aug. 20. The Sector of the Comet has regained nearly the same position as on Aug. 18, i.e. it lies as nearly as possible in the equatorial direction--the form of it has also somewhat changed, the nucleus seeming longer and narrower. The angle of the position of the tail as seen in the Finder I should estimate to be from 55 to 60--perhaps 58 would be exact Aug. 25. The reading of the Equatorial direction apparent East in the Telescope being 93 43' that of a tangent to the Sector at the middle of its convex side, toward apparent North of East, is 68. The angle of position of the tail was estimated to be about 70. Aug. 26. The Comet was seen by glimpses through cloud. The change in the appearance of the Sector since last night is most remarkable--there was no curvature, but the rays spread out from the nucleus like a fan. The Equatorial direction being 93 43' the central line of the fan gave 121 48' by a very hurried observation, as the Comet was not visible for more than twenty seconds on this the only occasion on which it was clear enough: it was...show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236756274
  • 9781236756275