Page 203

xciii

sen va petit a petit deffaillant. Vous avez ouy chi devant
comment elle rechoipt lunuere la moittie du soleil entie
re. Mais quant il convient quelle eclipse quant clarte
ne lui vient de nulle part. Et si ne lui advient fors
quant elle a tourne la moittie de son corps vers le
soleil et quelle nest continuellement enluminee.
Mais la lune qui ne va pas tousjours si droit comme
fait le soleil passe aulcuneffoiz par telle voie que la
terre la ombroie toute. Car la terre est plus grande
quelle nest et pour che le umbroie elle ainsi. Car entre
la lune et la terre a une ligne tant quelle se decline a
la lune tant comme son cours est plus ysuel et lors la
reffiert le soleil de ses rays et lui rend clarte. pourquoy
elle reprend sa lumiere. Mais dautant quelle passe
moins par celui umbre dautant lui encombre il moins
de sa clarte quelle rechoipt du soleil. quelque part quelle
soit fors quant elle se doit prendre a lombre. Si poevez
che ainsi entendre. Se une ligne passoit parmy la terre
par le point du milieu tout oultre hors de toutes deux
pars et passast tout oultre le corps du soleil tout par
droit regard. Et laultre chief par daultre part qui

103

gradually weakening. You have heard above
how half of it receives its light from the whole sun.
But when the time comes for it to eclipse, no brightness
comes from it anywhere. And this does not happen
except when it has turned half its body toward
the sun so that it is completely illuminated.
But the moon, which does not always go as straight
as the sun does, sometimes goes along a path such
that the earth entirely shadows it. For the earth is
large than it is, and for this reason can put it in shadow this way.
For between the moon and the earth there is a line that
bends toward the moon when it is on its usual course,
and when the sun remakes it with its rays and gives it
brightness. (see note) From this it regains its light. But the less
it passes through the shadow, the less it loses of
the brightness that it receives from the sun, wherever it
might be, except when it must be taken into shadow.
You can understand it like this: If a line passes through the earth
via its midpoint, extending outside both parts and reaching
straight as far as the body of the sun, and the other end

xciii

sen va petit a petit deffaillant. Vous avez ouy chi devant
comment elle rechoipt lunuere la moittie du soleil entie
re. Mais quant il convient quelle eclipse quant clarte
ne lui vient de nulle part. Et si ne lui advient fors
quant elle a tourne la moittie de son corps vers le
soleil et quelle nest continuellement enluminee.
Mais la lune qui ne va pas tousjours si droit comme
fait le soleil passe aulcuneffoiz par telle voie que la
terre la ombroie toute. Car la terre est plus grande
quelle nest et pour che le umbroie elle ainsi. Car entre
la lune et la terre a une ligne tant quelle se decline a
la lune tant comme son cours est plus ysuel et lors la
reffiert le soleil de ses rays et lui rend clarte. pourquoy
elle reprend sa lumiere. Mais dautant quelle passe
moins par celui umbre dautant lui encombre il moins
de sa clarte quelle rechoipt du soleil. quelque part quelle
soit fors quant elle se doit prendre a lombre. Si poevez
che ainsi entendre. Se une ligne passoit parmy la terre
par le point du milieu tout oultre hors de toutes deux
pars et passast tout oultre le corps du soleil tout par
droit regard. Et laultre chief par daultre part qui

103

gradually weakening. You have heard above
how half of it receives its light from the whole sun.
But when the time comes for it to eclipse, no brightness
comes from it anywhere. And this does not happen
except when it has turned half its body toward
the sun so that it is completely illuminated.
But the moon, which does not always go as straight
as the sun does, sometimes goes along a path such
that the earth entirely shadows it. For the earth is
large than it is, and for this reason can put it in shadow this way.
For between the moon and the earth there is a line that
bends toward the moon when it is on its usual course,
and when the sun remakes it with its rays and gives it
brightness. From this it regains its light. But the less
it passes through the shadow, the less it loses of
the brightness that it receives from the sun, wherever it
might be, except when it must be taken into shadow.
You can understand it like this: If a line passes through the earth
via its midpoint, extending outside both parts and reaching
straight as far as the body of the sun, and the other end