Ptolemys Tetrabiblos - Ch. 12
THE ANNUAL SEASONS

THE year comprises four seasons; spring, summer, autumn, and winter; of these, the spring partakes chiefly of moisture, for on the dissipation of cold and recommencement of warmth, an expansion of the fluids takes place: the summer is principally hot, owing to the Sun's nearest approach to the zenith: the autumn is principally dry, because the recent heat has absorbed the moisture: and the winter is chiefly cold, the Sun being then at his farthest distance from the zenith.

The beginning of the whole zodiacal circle (which in its nature as a circle can have no other beginning, nor end, capable of being determined), is therefore assumed to be the sign of Aries, which commences at the vernal equinox: 1 since the moisture of spring forms a primary beginning in the zodiac, analogous to the beginning of all animal life; which, in its first age of existence, abounds principally in moisture: the spring, too, like the first age of animal life, is soft and tender; it is therefore suitably placed as the opening of the year, and is followed by the other seasons in appropriate succession. The summer comes second, and, in its vigour and heat, agrees with the second age of animals; the prime of life, and the period most abounding in heat. Again, the age when the prime of life has passed away, and in which decay prepares to advance, is chiefly abundant in dryness, and corresponds to the autumn. And the final period of old age, hastening to dissolution, is principally cold, like the winter.