When a planet transits a particular sign or makes a certain aspect, we often experience themes corresponding to the characteristics of that sign or aspect.
Zodiac signs, planets, and aspects all have distinct energy signatures and can create energetic imprints that are re-activated later on when other planets, bodies, or points travel through the same area or form that same aspect.
Astrology shows us that everything is intricately and gorgeously connected. This has been understood within Earth's spiritual body of knowledge for millennia, but astrology shows us very clearly and specifically this web of energetic connection.
Nothing in nature exists in a vacuum. Events occurring in the present are intricately connected to what has gone on in the past, and both past and present are intricately connected to what happens in the future.
Astrological transits and aspects are a building progression throughout a human life. The work we put in under one transit or aspect - the experience gained and the understanding, awareness, and wisdom we come to - puts a foundation under us for future activations of that same area. This way, we keep growing and developing in life with each successive transit or aspect, with each new layer of the intricate and complex web of life that opens to us.
Consciously working with a particular transit or aspect, gaining awareness of what is required of us, allows us to move on from the lessons once they are learned/integrated and from the challenges once they have been overcome.
We're always working with this astrological progression. Because of this, it's often helpful to look back on previous transits and aspects to keep pertinent themes at the forefront of our minds. It's an exercise in increased awareness and also in maintaining a sense of context.