Astronomy and Astrophysics Volume 8

Astronomy and Astrophysics Volume 8

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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. 1889 edition. Excerpt: ...more than the moon's diameter. The plate used was a Carbutt A, grade of sensitiveness 12, and was exposed 10 seconds, between the 38th and 48th seconds after second contact. Those beautiful polar rays must stand out on the original negative with charming delicacy, because they are so well shown in this picture. We congratulate Professor Pickering on the success of his photographic work of the late eclipse. Observatory at Iowa College, Grinnell. A recent letter from Professor Buck, by whose earnest labors an Observatory has been recently equipped for Iowa College, informs us that a time service for the city of Grinnell is already in operation. He has contrived an ingenious device by which the steam whistles in the city may be blown daily that the Observatory time may be known. This is now done by a pushbutton in Professor Buck's studv. Occultation of Jupiter. The occultation of Jupiter by the moon March 23, was observed here with the 10%-inch equatorial. The sky was very clear, and the images fairly steady, considering the low altitude of the objects. The first contact was noted by me at 18A 45m 47s local sidereal time (corrected for clock error). The last contact at emersion was recorded at 19A 37m 31s. My young daughter, Anna Caroline (now eleven years of age, and whom I trust I may be allowed to say manifests a promising ability for precise observation), observed the phenomena with the 3-inch finder of the large instrument, and independently recorded the first contact one second earlier than above. After geometrical contact at immersion the moon's limb seemed to me to become indented, to give way, so to speak, before the planet, so that the limb of Jupiter appeared visible nearly three seconds after true geometrical contact. more

Product details

  • Paperback
  • 189 x 246 x 9mm | 304g
  • United States
  • English
  • black & white illustrations
  • 1236855752
  • 9781236855756