When two planets are 135° degrees apart (give or take a few degrees of orb) they are in a Sesquiquadrate aspect (sometimes called a Tri-Octile). Its effect is irritating, annoying and sometimes triggers anxiety, but can also be motivatingg.
The sesquiquadrate is based on dividing the circle into 8 equal segments and spans 3 of these equal sections. Geometrically, it is a "square and a half" (1½ x 90°).
Similar to the square, the sesquiquadrate represents a stressful yet dynamic relationship between the aspected planets. When used constructively, there is motivation for moving forward and/or pushing past obstacles that hinder forward progress. When the energy becomes stuck or uncontrolled, there can be a compulsive, obsessive or stubborn edge to it.
In the progression of aspects and development phases through the zodiac, the waxing sesquiquadrate begins the final phase before fruition or peak development. Between the sesquiquadrate and the opposition, it's not usually possible to start something new, but final or last-minute changes can be made before it's a "done deal."
The waning sesquiquadrate comes after the fruition or peak development point. Now that something has been accomplished or formed, what is to be done with it? Now comes a time of integration, connecting the dots with other parts of the system or situation, and exploring the potential and implications of what has been accomplished.
The aspect itself often indicates decisions and choices that need to be made, creating a turning point in the situation. If the aspect is waxing (the faster planet is heading away from the slower one) the question to ask yourself could be: Will you proceed to the next step, or will you change course while you can still do so (relatively easily)? If the aspect is waning (the faster planet is heading toward the slower planet), your question may be: Are you ready to do closure on a process that has run its course, or do you want to recycle it and take the situation to a new level?