De astronomia.
The Distinction of Geometry and Astronomy
Geometry and astronomy are distinguished not by different subject matter but by their mode of contemplation: geometry considers the immovable dimensions of space, while astronomy observes the motion of the stars and the intervals of time.
Nor is it a contradiction that earlier we assigned immovable magnitude to geometry and movable magnitude to astronomy, because that distinction was made according to the original discovery, under which geometry is also called the measure of the earth. Or we can say that what geometry considers in the sphere of the world — that is, the dimension of regions and of the celestial circles — is immovable, insofar as it pertains to geometrical consideration. For geometry does not consider motion, but space. But what astronomy contemplates as movable is the course of the stars and the intervals of times. And so in general we say that immovable magnitude is subjected to geometry and movable magnitude to astronomy, because, although both disciplines deal with the same subject matter, one contemplates what endures while the other observes what passes away.
Read the original Latin
Nec contrarium est, quod superius immobilem magnitudinem geometriae attribuimus et mobilem astronomiae, quia hoc secundum primam inventionem dictum est, secundum quam etiam geometria mensura terrae dicitur. vel possumus dicere quod id quod geometria in sphaera mundi considerat, id est, dimensio regionum et circulorum caelestium, immobile sit, secundum hoc quod ad geometricam considerationem pertinet. geometria enim non considerat motum, sed spatium. quod autem astronomia speculatur mobile sit, id est, cursus astrorum et intervalla temporum. sicque universaliter dicemus immobilem magnitudinem geometriae esse subiectam, mobilem astronomiae, quia, licet ambae de eadem re agant, una tamen contemplatur id quod permanet, altera id quod transit speculatur.
Didascalicon de Studio Legendi (On the Study of Reading) companion
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