...Thespeed or slowness of his recognition of such periodic or cyclicchanges in nature will depend largely on the length of theparticular cycle... 
Sir James George Frazer 「The Golden Bough」
...The excessively dry climateof this region, which in one respect has made the preservation of theruin possible, has also furnished, in its periodic sandstorms, a mostefficient agent of destruction...
Cosmos Mindeleff 「The Repair Of Casa Grande Ruin, Arizona, in 1891」
...The periodic festival begets a kind of not immortal,but perennial, god...
Jane Ellen Harrison 「Ancient Art and Ritual」
...The major planets were supposed to revolve in thedeferent round the earth in their own periodic times, and in their epicyclesonce in a year...
George Forbes 「History of Astronomy」
...It took him nine years more to discover his third law,that the squares of the periodic times are proportional to the cubes of themean distances from the sun...
George Forbes 「History of Astronomy」
...Thus, it is known that the sun-spot period, as remarked in a preceding chapter, coincides in a most remarkable manner with the periodic fluctuations in the magnetic state of the earth...
Garrett Serviss 「Curiosities of the Sky」
...‘The squares of the periodic times of any two planets areproportional to the cubes of their mean distances from the Sun...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
..."The squares of the periodic times are proportional to the cubesof the mean distances...
Robert Stawell Ball 「The Story of the Heavens」
...It was also perceived that these objects underwent a remarkableseries of periodic changes...
Robert Stawell Ball 「The Story of the Heavens」
...Let the masses of all the bodies in thishypothetical system be identical with the masses in our system, and letthe distances and the periodic times be the same in the two cases...
Robert Stawell Ball 「The Story of the Heavens」
...Nor was it long before the discovery of a periodic comet was made whichillustrated, in a striking manner, the soundness of the anticipationjust expressed...
Robert Stawell Ball 「The Story of the Heavens」
...Most of the other periodic comets have periods muchshorter than that of Halley...
Robert Stawell Ball 「The Story of the Heavens」
...It can bedemonstrated that a resisting medium such as we have supposed wouldlessen the size of the comet's path, and diminish the periodic time...
Robert Stawell Ball 「The Story of the Heavens」
...We arealso, in the case of several other periodic comets, able to fix in asimilar way the date when they started on their journeys in theirpresent elliptic orbits...
Robert Stawell Ball 「The Story of the Heavens」
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