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  1. Semi Major Axis

    Linked via "Apoapsis Distance ($r_a$)"

    Periapsis Distance ($r_p$): The closest approach distance (e.g., perihelion for the Sun/), perigee for Earth).
    $$r_p = a(1 - e)$$
    Apoapsis Distance ($r_a$): The farthest distance (e.g., aphelion or apogee).
    $$r_a = a(1 + e)$$