And these two properties are in Astrology, for in completing its
circle, as in the acquirement of this Science, the greatest space of
time is revolved, because its demonstrations are more than any other
of the aforementioned Sciences, and long experience is requisite to
those who would acquire good judgment in it. And again, it is the
highest of all the others, because, as Aristotle says in the
commencement of his book on the Soul, the Science is high, because of
its nobility, and because of the nobleness of its subject and its
certainty. And this Science more than any other of those mentioned
above is noble and high, for noble and high is its subject, which is
the movement of the Heavens; and high and noble, because of its
certainty, which is without any defect, even as that which springs
from the most perfect and most regular principle. And if any one
believe that there is defect in it, it is not on the part of the
Science, but, as Ptolemy says, it is through our negligence, and to
that it must be imputed.




CHAPTER XV.


After the comparisons which I have made of the seven first Heavens, we
must now proceed to the others, which are three, as has been often
stated.

I say that the Starry Heaven may be compared to Physics because of
three properties, and to Metaphysics because of three others. For it
shows us of itself two visible things, such as the multitude of stars