The center of mass of an individual’s “sphere of activity” refers to the area or field of activity where the majority of the individual’s time, energy and resources are concentrated. It is the area where the individual’s actions and decisions are likely to have the most significant impact and where the individual is able to make the most significant contributions.

The center of mass of an individual’s “sphere of activity” can change over time depending on factors such as career changes, personal developments, and life events. For example, the center of mass of an individual’s “sphere of activity” may be within their work, family, community, or personal hobbies at different times in their life.

It’s important to note that the concept of center of mass of an individual’s “sphere of activity” is also a metaphorical one and it’s not a physical concept that can be measured. It’s a way of describing the most important or significant area of activity of an individual, in order to understand the impact that person can have and the areas where they are most likely to be productive or effective.