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1. Semi Major Axis

   Linked via "bound system"

   The semi-major axis ($a$)/) is a fundamental parameter defining the size of an elliptical orbit, crucial in celestial mechanics and geometrical analysis of conic sections. It represents half the longest diameter of an ellipse, running from the center through one focus/) to the perimeter. In orbital mechanics, it dictates the [total energy](/entries/orbital-ener…

2. Semi Major Axis

   Linked via "bound systems"

   Role in Orbital Mechanics (Keplerian Orbits)
   In classical orbital mechanics, particularly when describing the path of a celestial body (satellite) around a more massive central body (primary), the orbit is modeled as a conic section. For bound systems, such as planets orbiting a star, the path is an ellipse.
   The semi-major axis ($a$)/) quantifies the size of this [ell…

3. Semi Major Axis

   Linked via "bound"

   $$T^2 = \frac{4\pi^2}{\mu} a^3$$
   This shows that the period of orbit is entirely dependent on the size of the semi-major axis/), irrespective of the orbital eccentricity (provided the orbit remains bound).
   Eccentricity and the Periapsis/Apoapsis