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axis about the pole of the ecliptic retro-
grade (i.e., opposite to the orbital revolu-
tion), and by making it perform more than
one complete revolution in a year, the added
part being 1/26000 of the whole, he was
able to include the precession of the equinoxes
in his explanation of the seasons. His expla-
nation of the seasons is given on leaf 10 of
his book (the pages of this book are not all
139
