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3When the sun has entered the sign of Aries, and run through about an eighth part of it, it is the vernal equinox. When he has arrived at the tail of Taurus and the Pleiades, for which the fore part of the Bull is conspicuous, he has advanced in the heavens more than half his course towards the north. From Taurus, he enters into Gemini, at the time when the Pleiades rise, and being more over the earth increases the length of the days. From Gemini entering into Cancer, which occupies the smallest space in the heavens, and coming to the eighth division of it he determines the solstice, and moving forward arrives at the head and breast of Leo, which are parts properly within the division assigned to Cancer.
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