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1. Orbital Elements

   Linked via "spherical gravity fields"

   The Classical Keplerian Elements
   The six classical elements, often referred to as the Keplerian Elements, are derived by analyzing the geometry of the orbit in relation to a defined reference plane, typically the fundamental plane of the celestial sphere or the orbital plane itself. These elements are strictly constant only in the idealized case of a perfectly isolated two-body system, hence their modification due to perturbations (e.g., [atmo…