The course which the Creator Text, ὁ Δημιουργός. Variant, ὁ δημιουργήσας. appointed for them to run is unceasing and remaineth fixed as He established them. For the divine David says, The moon and the stars which Thou establishedst Ps. viii. 3., and by the word ‘establishedst,’ he referred to the fixity and unchangeableness of the order and series granted to them by God. For He appointed them for seasons, and signs, and days and years. It is through the Sun that the four seasons are brought about. And the first of these is spring: for in it God created all things Basil, Hom. 6, in Hexaëmeron., and even down to the present time its presence is evidenced by the bursting of the flowers into bud, and this is the equinoctial period, since day and night each consist of twelve hours. It is caused by the sun rising in the middle, and is mild and increases the blood, and is warm and moist, and holds a position midway between winter and summer, being warmer and drier than winter, but colder and moister than summer. This season lasts from March 21st till June 24th. Next, when the rising of the sun moves towards more northerly parts, the season of summer succeeds, which has a place midway between spring and autumn, combining the warmth of spring with the dryness of autumn: for it is dry and warm, and increases the yellow bile. In it falls the longest day, which has fifteen hours, and the shortest night of all, having only nine hours. This season lasts from June 24th till September 25th. Then when the sun again returns to the middle, autumn takes the place of summer. It has a medium amount of cold and heat, dryness and moisture, and holds a place midway between summer and winter, combining the dryness of summer with the cold of winter. For it is cold and dry, and increases the black bile. This season, again, is equinoctial, both day and night consisting of twelve hours, and it lasts from September 25th till December 25th. And when the rising of the sun sinks to its smallest and lowest point, i.e. the south, winter is reached, with its cold and moisture. It occupies a place midway between autumn and spring, combining the cold of autumn and the moisture of spring. In it falls the shortest day, which has only nine hours, and the longest night, which has fifteen: and it lasts from December 25th till March 21st. For the Creator made this wise provision that we should not pass from the extreme of cold, or heat, or dryness, or moisture, to the opposite extreme, and thus incur grievous maladies. For reason itself teaches us the danger of sudden changes.