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Isidorus, Etymologiae, Liber 3, XXXVIII De cardinibus caeli <<<     >>> XL De ianuis caeli

Isidorus, Etymologiae, 3, XXXIX De convexis caeli

1 Convexa autem caeli extrema eius sunt, a curvitate dicta, ut est illud:
Convexum quotiens cludit nox humida caelum.
Convexum enim curvum est, quasi conversum seu inclinatum, et in modum circuli flexum.
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