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The days of the Mosaic creation are not to be strictly construed as implying the same length of time which is at present occupied by a single revolution of our globe, but PERIODS of a much longer extent.

William Buckland (1820). “Vindiciæ Geologicæ: The Connexion of Geology with Religion, Explained in an Inaugural Lecture Delivered Before University of Oxford, May 15, 1819, on the Endowment of Readership in Geology”, p.32
The days of the Mosaic creation are not to be strictly construed as implying the same length of time which is at present occupied by a single revolution of our globe, but PERIODS of a much longer extent.