Linked from

The 15 pages that link to Semimajor axis, each with the reason it gives.

• Kepler's laws of planetary motionRelated: It is the precise orbital size used in the third law.

• Orbital eccentricityRelated: Together with eccentricity, it sets an ellipse’s dimensions and focus distance.

• Orbital periodRelated: For a given central mass, a larger semimajor axis means a longer period.

• Vis-viva equationRelated: It determines the orbital energy and therefore the speed scale.

• PerihelionRelated: Together with eccentricity, it sets the perihelion distance: the semimajor axis times one minus eccentricity.

• Specific orbital energyRelated: For a bound two-body orbit, specific energy is inversely proportional to this length.

• True anomalyRelated: It helps set the scale of an elliptical orbit whose position true anomaly specifies.

• Orbital energyRelated: For a bound Keplerian orbit, energy fixes the semimajor axis regardless of eccentricity.

• Kepler orbitRelated: For bound Kepler orbits, it sets orbital size and period.

• Kepler's first lawRelated: It sets the characteristic size of the orbital ellipse.