The hard aspects are the square and the opposition.The square is 90 degrees. The opposition is 180 degrees. The square will be three signs away. The opposition will be opposite. The squares always square the same quadruplicity. The quadriplicity is a categorization. The quadriplicities are Cardinal. Fixed and Mutable. These give a lot of information about a person–a lot. They give it in an easy way so it is good to talk about the Quadriplicities.The square will always be of the same Quadriplicty. In other words, squares are always from Cardinal signs to Cardinal signs. They are always from fixed signs to fixed signs. They are always from Mutable signs to Mutable signs. The opposition will always be in opposite signs and the same Quadriplicity. For example Aries is opposite Libra but they are both Cardinal. Taurus is opposite Scorpio but they are both Fixed Signs. Gemini is opposite Sagittarius but both are Mutable Signs. You can look at the whole chart in this way. Remember, the chart is very very logical.
Back to the Quadriplicities. Cardinalsigns are the leaders: the take action sign. Fixed signs are the stubborn ones. They will move in their own good time. Mutablesigns are flexible but can have a weaker sense of self : a weaker self definition. You can see how the same Quadriplicity could lock horns. This can happen in the natal chart as well as in synastry. In the natal chart, one is stuck with this locked tug of war. That is my feeling. These energies will be locked until the day you die, as that is the nature of the square.Just by this one article alone, you may understand why some people rub you wrong.The signs which are squares to our stellium( 3 or more planets in the same sign) annoy us. You will understand many things which have previously been unknown by this small understanding of Astrology