During January 2025, this developer enhanced the APSIS-ANALYSIS/PERIGEE repository by implementing a unary minus operator for the Vector_3 class, enabling direct vector negation within the codebase. They approached the task with a focus on API completeness and reliability, using C++ and CMake to integrate the new operator and its supporting unit tests. Their work included improvements to the test infrastructure, ensuring robust validation of vector math operations. The developer delivered these changes through concise, reviewable commits, emphasizing maintainability and clarity. While no major bugs were addressed, their contributions strengthened the foundation for future vector math development and testing.