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Philosophical Transactions of the Royal Society of London
You have accessAstronomical observation

The observations of the spots of the sun, made at the Royal Academy at Paris, continued; and English’t out of French

    Having formerly communicated the observations of the new spots in the Sun, together with Signor Cassini's way of noting their scituation in his disque; which hath served to determine the time when they should be visible on its apparent surface, and how long they should remain an his hidden hemisphere before their re-appearing to us, and lastly to calculate the duration of their periodical revolution about his axis; it may justly be expected, we should give the sequele of what hath been obeserved since the first and last appearance of these spots.

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