quapropter luna necesse est, quandoquidem claram speciem certamque figuram praebet, ut est oris extremis cumque notata, quantaque quantast, hinc nobis videatur in alto.
Therefore the moon,  since it offers a clear appearance and a firm outline, must be seen on high by us from the earth in exactly the shape that defines it and of the size it really is.
final_alignments\Lucretius_De_Rerum_Natura_Book5.json