Here is the developmental history of Star Therapy as described in the sources:

• Star Therapy developed out of Silvia Hartmann's work with Modern Energy. Modern Energy is an approach to personal development and healing that focuses on working with the living energy body, which places it in the Third Field in the Mind, Body, Spirit triad. 
• Hartmann's work with clients in Modern Energy led to the development of Star Matrix, the foundation for Star Therapy. Hartmann observed that her most successful therapeutic interventions involved helping clients access and work with their high positive memories. She began referring to these high positive memories as "Star Memories."
• In 2019, Hartmann conducted "Project 11," the first organized attempt to apply the principles of Star Matrix to group therapy. This project focused on helping participants access and explore their Star Memories. The majority of participants reported improvements in their self-esteem, attitude toward past trauma, and overall well-being.
• Hartmann observed that working with a client's Star Memories often revealed patterns and connections between seemingly unrelated events. She referred to these patterns as "Star Constellations".
• The discovery of Star Constellations led Hartmann to develop StarLine Therapy. StarLine Therapy is a type of therapy that uses Star Matrix principles, techniques and methods to help clients heal their broken timelines by reconnecting with their Star Memories across their entire life, thereby creating a StarLine that holds their entire life together. 
• StarLine Therapy is a journey that helps clients develop a new "story of their lives" based on their Star Memories, rather than on their trauma. By focusing on their positive experiences, clients can experience healing, transformation, a sense of empowerment and a future trajectory.
• StarLine Therapy Professional is a course developed by Hartmann that certifies therapists to practice Star Therapy. The course covers the principles of Modern Energy, Star Matrix, and StarLine Therapy.

The sources emphasize that Star Therapy is a form of energy work, not psychology. It is designed to help clients access and work with the positive energy within their living energy bodies.

Here are some key concepts of Star Therapy and its history, according to the sources:

• Star Memories: These are the positive memories and experiences in a person's life. They are viewed as sources of strength, wisdom, and healing.
• Star Events: These are transformative personal experiences that are marked by positive emotions, insights, and a shift in perspective. They are viewed as significant moments of growth and evolution.
• Star Constellations: These are collections of Star Memories that reveal patterns in a person's life. They can provide insights into a person's strengths, values, and purpose.
• The StarLine: This is a timeline that exclusively contains a person's Star Events. The sources state that we all have a StarLine that exists independently of trauma and negativity.
• BrightFields and DarkFields: StarLine Therapy uses these concepts to help clients understand their entire timeline. BrightFields are periods of time when the client was generally happy and thriving. DarkFields are periods of time when the client experienced significant challenges or trauma.
• The Importance of the Therapist's Own Star Events: Star Therapy emphasizes the role of the therapist's personal experience in the therapeutic process. Therapists are encouraged to share their own Star Stories and insights with their clients and to use their intuition and experience to create personalized treatment plans.

Even as Star Therapy is an evolving and rapidly expanding field, it is suggested that Star Therapy will unlock new levels of healing potential for both clients and therapists that were never possible before.