The great authority of Augustine, and the cogency of his scriptural argument, held the Church firmly against the doctrine of the antipodes; all schools of interpretation were now agreed--the followers of the allegorical tendencies of Alexandria, the strictly literals exegetes of Syria, the more eclectic theologians of the West. For over a thousand years it was held in the Church, "always, everywhere, and by all," that there could not be human beings on the opposite sides of the earth, even if the earth had opposite sides; and, when attacked by gainsayers the great mass of true believers, from the fourth century to the fifteenth, simply used that opiate which had so soothing an effect on John Henry Newman in the nineteenth century--securus judicat orbis terrarum.
•pg 104 War Between Science and Theology…White
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•Bishop Isidore of Seville (560-636) taught in his widely read encyclopedia, The etymologies, that the earth was round. While some writers have thought he referred to a spherical Earth, this and other writings make it clear that he considered the earth to be a disk of wheel shaped. Isidore did not admit the possibility of people dwelling at the antipodes, considering them as legendary, and noting that there was no evidence for their existence. --The Esoteric Codex: Dynamics of the Celestial Spheres
So now, where oh where are the Catholic teachings of a spherical earth?