...Observations of the changeable brightness of the satellites ofJupiter, and of the variation in their apparent magnitudes, with adetermination of the time of their rotatory motions on their axes... 
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...A typical spiral nebula is composed of a disc-shaped central portion,with long curved arms projecting from opposite sides of it, which givean impression of rapid rotatory movement...
Cecil G. Dolmage 「Astronomy of To-day」
...At the top (1) wesee how each line would look if there was no rotatory motion; the threelines produced by ring, planet, and ring are in a straight line...
Robert Stawell Ball 「The Story of the Heavens」
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