What is the primary physical justification for describing the Earth orbiting the Sun, rather than vice versa?

Answer

The Sun contains over 99.8% of the solar system’s mass

The physical reality of the solar system's dynamics is dictated by the immense mass difference; the Sun containing over 99.8% of the mass means describing the system with the Earth moving around the Sun accurately reflects the physical interaction.

What is the primary physical justification for describing the Earth orbiting the Sun, rather than vice versa?
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