adversus

quod sidera abscondit, quod terras, cum tanto maior sit illis, non urit sed calorem suum intensionibus ac remissionibus temperando fovet, quod lunam numquam implet nisi adversam sibi, nec obscurat nisi obliquam

‘It hides the stars. Although the sun is much larger than the earth it does not burn it up but fosters it by controlling its heat in an alternately more intense and more subdued degree. It never causes the moon to be full unless it is opposite, nor dims it by phases unless it is oblique.’

iuvat ire per ipsum aera et immenso spatiantem vivere caelo et adversos stellarum noscere cursus.

‘It is my delight to traverse the very air and spend my life touring the boundless skies, learning of the constellations and the contrary motions of the planets.’

of lines

His adice obliquos adversaque fila trahentis inter se gyros

‘To these you must add two circles which lie athwart and trace lines that cross each other.’