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| | Tetrabiblos |
 | | Two signs are called equinoctial, the One which is first from the spring equinox, Aries, and the one which begins with the autumnal equinox, Libra; and they too again are named from what happens there, because when the sun is at the beginning of these signs he makes the nights exactly equal to the days. |
 | | The bicorporeal signs, Gemini, Virgo, Sagittarius, and Pisces, are those which follow the solid signs, and are so called because they are between the solid and the solstitial and equinoctial signs and share, as it were, at end and beginning, the natural properties of the two states of weather. |
 | | This is ascertained from the special nature and form of the zodiacal signs in which happen to be the places of the eclipses and in which are the heavenly bodies, planets and fixed stars alike, that govern both the sign of the eclipse and that of the angle preceding the eclipse. |
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