Monthly Notices of the Royal Astronomical Society Volume N . 28-29

Monthly Notices of the Royal Astronomical Society Volume N . 28-29

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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. 1868 edition. Excerpt: ...bad. Mr. Pritchard has kindly informed me that the shadow of a black disk is a white spot. Possibly this may prove the explanation of these otherwise unaccountable appearances. When the limb of the planet was still distant nearly onethird of its diameter from the Sun's limb, the limb of the planet seemed drawn out towards the Sun's limb. About 23s after this the contact seemed complete. For this observation I used a silvered-glass reflector of 4 J-in. diameter, and 5J feet focus, made for me by Mr. With. The mirror had been tested up to 700 on stars. The Sun being low I did not use a solar eye-piece, but simply modified the light with a sliding wedge of dark neutral tint-glass corrected for refraction. Of the three drawings I have the honour of exhibiting before the Society the first represents the planet and shows the aureola and the two white spots. The other two show the appearance of the planet at the times of real and apparent contact with the Sun's limb. As I did not see either the aureola or the white spots towards the time of contact, I have omitted them in the figures which represent the contact. The Transit of Mercury. By C. G. Talmage, Esq. The transit of Mercury was well seen here. At sunrise the sky was perfectly cloudless, and remained so until nearly noon. When I first directed the telescope to the Sun at 19" 50"1 M.T. the limbs were boiling violently, but by 20h 3om the definition was greatly improved. From the first the limbs of Mercuryvrere much better defined than those of the Sun. I watched very carefully for any apparent distortion of the limbs of Mercury, but saw none. The time of internal first contact I consider better than the time of last contact. Egress. h m h m First contact 21 o 1238 Last contact 21 3 5 70 more

Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236582535
  • 9781236582539