File:Nature (1885) (14577746078).jpg

Identifier: nature321885lock (find matches)
Title: Nature
Year: 1869 (1860s)
Authors: Lockyer, Norman, Sir, 1836-1920. edt
Subjects: Science Science Sciences Biologie Physique Natuurwetenschappen CIENCIA NATURAL HISTORY BIOLOGY SCIENCE
Publisher: (London, etc., Macmillan Journals Ltd., etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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od was one minute less than the mean of the twopreceding years. But my observation of November 21was considered rather late, and the interval being a veryshort one of only six days, would originate a rather largeerror. But the four short intervals, from November 27 toDecember 31, e.vhibit a singular consistency in there-suiting periods, the mean being gh. 49m. 36i6s., whichproves the real increase of speed to have been 3609s. in May 14, (885) NA rURE 33 each (rotation ; and, if we amalgamate the two precedingperiods, from November 7 to November 27, we get amean of gh. 49m. 38-96s., which is closely accordant. In the forty days, November2i to December 31,the spotgained 65-im. = 397° upon Mr. Marths central meridian (Monthly Notices, vol. xliv. No. 9), based on the period of9h. 50m. 12253. The spot must therefore have moved28,700 miles to the westward at the rate of 717 miles perterrestrial day, and 294 miles per Jovian day. Then afterJanuary 13 it suddenly retrograded if we accept the
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Fig. i.-Probably recurrent markings on Jupiter. I. 18^7- November 27 (Dawes). 11. 1859, December 29 loh.soni. (Hoggins). III. 1858. March 2, 9h.(Huggins). IV. 1870, January 23, 8h. 20m. (Gledhill). V. 1872, February 2, loh. 30m. (Gledlull). VI. 1885, February 25, I2h. 50™. (Denning). identity of the spots observed on January 13 and 27 ; so I The motion of this brilliant white spot prior tothat in the fourteen days it lost nearly 11,000 miles, January 13 is involved in no doubt whatever, so thatwhich is greater than the rate of its previous excess. But the question of its identity with the one observedsince the end of January the motion has steadied down j on January 27 is an entirely separate one, and cannotto its normal degree, and thus we find the period closely i aftect the remarkable phenomena, which the mcreasedagreeing with that adopted by Mr. Marth. 1 velocity exhibited, except as to the retrogressive motion 34 NATURE (May 14, 1885 which subsequently occurred. The question of

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