The Observatory Volume 20, Nos. 248-260 (Paperback)

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. 1897 Excerpt: ...distanoe. Under these circumstances it seems proper that I should leave the subject in his hands, and limit my second paper to some methods of estimation not hitherto applied. Very respectfully, Nautical Almanac Office, 8. Nbwcomb. U.S. Naval Observatory, Washington, 1897, May 17. A peculiar Spot on Jupiter. Gentlemen, --There are spots on Jupiter which remain for several years apparently unchanged, or at least almost immovable. Such are the "great red spot" and the two "garnet-red spots" which I observed from September 20 and 27, 1894, till June 8, 1896. I have good reason to suppose that there is a brilliant doublespot in the South Temperate Band, above the left "shoulder," apparently in connection with the "great red spot," because every drawing shows it near the same place. Examining my drawings made at the apparition 1894-95 I found three spots above the left "shoulder," which occupy the following positions: --1895, January 24 =352; 6; 200. 27 X= 2; 10; 21 March 16 X =346; 357; 10 18 X=35 5 2 April 4 X=3S A glimpse on my drawings published in No. 3322 of the Astr. Nachr. (also in Nos. 1553, 1556, 1560, 1564, 1569, and 1574 of the 'English Mechanic ') will show that the identity of these three, a triangle forming spots, is beyond doubt. My drawings at the apparition 1895-96 (published under the title "Jupiter-Beobachtungen 1895-96 an der Manora-Sternwarte," in vol. lxiv. of the 'Denkschriften' of the Imperial Academy of Sciences, Vienna--8 plates, with 15 charts and 15 drawings, all show that on 16 days between 1895 Nov. 16 and 1896 May 18 spots were seen in positions not very far from those given above, one, two, or three at a time. During the present apparition I found similar spots in the foll...