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60.
SHADOW AND LIGHT.
The forms of shadows are three: inasmuch as if the solid body which
casts the shadow is equal (in size) to the light, the shadow
resembles a column without any termination (in length). If the body
is larger than the light the shadow resembles a truncated and
inverted pyramid, and its length has also no defined termination.
But if the body is smaller than the light, the shadow will resemble
a pyramid and come to an end, as is seen in eclipses of the moon.
1
61.
OF SIMPLE DERIVED SHADOWS.
The simple derived shadow is of two kinds: one kind which has its
length defined, and two kinds which are undefined; and the defined
shadow is pyramidal. Of the two undefined, one is a column and the
other spreads out; and all three have rectilinear outlines. But the
converging, that is the pyramidal, shadow proceeds from a body that
is smaller than the light, and the columnar from a body equal in
size to the light, and the spreading shadow from a body larger than
the light; &c.
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