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Philosophical Transactions of the Royal Society of London

    This occurs in the Journal des Scavans n°. 36. as it had been proposed and communicated by the learned Jesuit DE BILLY. viz. Multiply the solar cycle by 4845. and the lunar, by 4200. and that of the indiction, by 6916. Then divide the sum of the products by 7980. which is the Julian period: the remainder of the division, without having regard to the quotient, shall be the year required after.

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