tertiary planet

Etymology
.

Noun

 * 1)  the third planet; usually counting outwards from the central sun
 * 2)  A planet of the third-degree/third-order. The planet of a planet (secondary planet) of a planet (primary planet). An object (moonmoon) which orbits an object (moon) which orbits an object (planet) which orbits a star.
 * 3)  An aspect in astrology, a calculated node in a reading, that is not a real planet.