Memoirs of the Royal Astronomical Society Volume 46-47

Memoirs of the Royal Astronomical Society Volume 46-47

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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. 1881 edition. Excerpt: ... least twothirds of Venus's diameter. The eyepiece was changed to one of 330, but no other noteworthy appearances presented themselves. From 2" 15"' to 2" 27"' sixteen measures of the diameter of the planet were obtained with the Double Image Micrometer by Mr. WHITE and myself, eight in a direction perpendicular to the Sun's limb, and eight parallel to it. At 3" 2 3"" I began to look out for Internal Contact, and the following observations were made: .. Melbourne Mean Time. Eyepiece same as at ingress. 1 Haze or smoky appearance first seen to join limbs h m B of 0 and 9.. 3 26 57"6 2 First saw a distinct thread in centre of haze 3 28 14'o 3 Tremulous junction of limbs. 3 29 3'7 4 Distinct junction of limbs 3 29 20' 5 Last External Contact very uncertain, between The smoky junction appeared very faint at first, but unsteady as regards width, sometimes narrow, at other times as wide as one-third of the diameter of the planet. It was never black, but only like a thin smoke (Plate I. fig. 5). The thread was much darker than the smoke, less defined and more nebulous than at ingress. The treinulous junction was due to the disturbed state of the atmosphere and boiling of the edges of the Sun and Venus, whereby they appeared at one instant joined and then separated, a slight haze always appearing at the separation (fig. 7). Distinct junction is marked where they no longer appeared to separate by the tremulous motion. There was a very marked appearance of Venus throughout the earlier stages of the Transit, not entered in the notes, which may be described as follows: ---The outer portion of the disk of Venus was coloured a very deep blue (indigo), and the colour extended from the...show more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236991494
  • 9781236991492