The T-square is an aspect pattern involving two planets in opposition that are squared by a third planet. The aspects contained in the configuration are highly energetic and conflicting. The planets usually occupy the same quadruplicity and emphasize the inherent dilemma of the Cardinal, Fixed or Mutable quality on the individual birth chart. The configuration can lead to great accomplishment when greater effort is applied to directing the planets. Some T-squares consist of more than three planets and the astrologer views this as a powerful feature in the horoscope.
Oppositions reflect being pulled in two directions, and with a T-square the personality is pulled in all three areas, hence, it is believed that an individual born with such a configuration in their natal chart is presented with more challenges than the average person. With oppositions, there is an element of compatibility and there can be a compromise reached if planets, signs and houses learn to adapt to one another. The apex planet, however, is the most antagonistic in the configuration. The focus planet (apex) can often be over-emphasized in the individual’s personality, and it can be in a positive or negative way. In general, though, T-squares are great driving forces in the natal chart and create action, achievement, and drive.
Even if you don’t have some of the chart configurations natally in astrology, it is well worth reading up on all of the astrological topics. Because you will have transits and such forming these patterns in your birth chart. Life is full of movement and Sun and Moon signs and so forth are always changing new signs, and people are forming tense t-squares or planets through houses and experiencing yod patterns and so forth, even if this is not a natal chart picture.
The CARDINAL T-SQUARE (planets in Aries, Cancer, Libra, and Capricorn) is the most ambitious, and it is often good for these people to start their own business and to drive the energy constructively. Cardinal signs tend to initiate new activities and act immediately, and they often move towards achievement and are good at getting things started.
The FIXED T-SQUARE (planets in Taurus, Leo, Scorpio, and Aquarius) is driven by intensity, focus and willpower. These types are less likely to give up and keep going until they reach their goal. In response to changing circumstances, fixed signs tend to persist in acting to according pre-established patterns. The fixed signs can manifest as strength and focus, but negatively, as inflexibility and stubbornness.
The MUTABLE T-SQUARE (planets in Gemini, Virgo, Sagittarius and Pisces) are more suited to the learning environment and they have great adaptability, creativity and drive to learn about their environment. Mutable signs tend to act to new situations by being flexible, but they can also be too pliable and changeable.