File:Astronomy for high schools and colleges (1881) (14761490604).jpg

Identifier: astronomyforhigh00newc (find matches)
Title: Astronomy for high schools and colleges
Year: 1881 (1880s)
Authors: Newcomb, Simon, 1835-1909 Holden, Edward Singleton, 1846-1914, joint author
Subjects: Astronomy
Publisher: New York, H. Holt and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ion of the bands varies in latitude, and the shapes ofthe limiting curves also change from day to day ; but inthe main they remain as permanent features of the regionto which they belong. Two such bands are usually vis-ible, but often more are seen. For example, Cassini(1690, December 16th) saw six parallel bands extendingcompletely around the planet. Herschel, in the year1Y93, attributed the aspects of the bands to zones of theplanets atmosphere more tranquil and less filled withclouds than the remaining portions, so as to permit the A8PECT OF JUPITER. 345 true surface of the planet to be seen tkrougli tliese zones,while the prevaiHng clouds in the other regions givea brighter tint to these latter. The color of the bandsseems to vary from time to time, and their bordennglines sometimes alter with such rapidity as to show thatthese borders are formed of something like clouds. The clouds themselves can easily be seen at times, andthey have every variety of shape, sometimes appearing as
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Fig. 92.—telescopic view of jupiter, with a satellite andits shadow seen on it. brilliant circular white masses, but oftener they are similarin form to a series of wliite cumulous clouds such as arefrequently seen piled up near the horizon on a summersday. The bands themselves seem frequently to be veiledover with something like the thin cirrus clouds of ouratmosphere. On one occasion an annulus of white cloudwas seen on one of the dark bands for many days, retain-ing its shape through the whole period. h. m. s. ation time = 9 56 00 = 9 55 40 - = 9 50 48 = 9 56 56 = 9 55 26 = 9 55 21 .= 9 55 29 346 ASTRONOMY. Such clouds can be tolerably accurately observed, andmay be used to determine tlie rotation time of the planet.These observations show that the clouds have often amotion of their own, which is also evident from other con-siderations. The following results of observation of spots situated invarious regions of the planet will illustrate this : Cassini 1665, Hehschel 1778, Hersche

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