... Royalty payments must be paid within 60 days following each date on which you prepare (or are legally required to prepare) your periodic tax returns... 
Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...The general conclusion is, that at those periodic or occasionalceremonies the ancient Aryans both kindled and fed the fire withthe sacred oak-wood...
Sir James George Frazer 「The Golden Bough」
...Had there been no periodic festivals, personification might long havehalted...
Jane Ellen Harrison 「Ancient Art and Ritual」
...One of thechief periodic festivals at Athens was the Spring Festival of theDithyramb...
Jane Ellen Harrison 「Ancient Art and Ritual」
...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」
...But the development of Mendeléeff’s Periodic Law has shown that theelements are not to be regarded as disconnected entities...
E. Walter Maunder 「Are the Planets Inhabited?」
...Started on its elliptic path, the planet pursues its stately course, andafter a certain duration, known as the periodic time, regains theposition from which its departure was taken...
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」
...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」
...There are now several comets known which revolve in elliptic paths, andare, accordingly, entitled to be termed periodic...
Robert Stawell Ball 「The Story of the Heavens」
...We have selected the comets of Halley and of Encke as illustrations ofthe class of periodic comets, of which, indeed, they are the mostremarkable members...
Robert Stawell Ball 「The Story of the Heavens」
...Ifthe comet be a periodic one, the same series of changes may take placeat its next return to perihelion...
Robert Stawell Ball 「The Story of the Heavens」
...We can evenconceive that a comet may in this manner be completely dissipated, andwe shall see in the next chapter how this fate seems to have overtakenBiela's periodic comet...
Robert Stawell Ball 「The Story of the Heavens」
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