The system of Tamoachan is a binary. The two stars, a stable yellow named Tonatiu, and a bloated red giant named Ixtlanticutli which is in the process of slowly expanding. Five planets orbit Tonitiu, and one orbits Ixlanticutli. In addition, there are five lagrange points which hold numerous asteroids in relatively stable orbits. These are refered to as Ehecalli, or "Wind Homes".
Paynal (PAY-nahl): held in a tight orbit by the gravity of Tonatiu, this small planet once had an atmosphere, but was blasted by constant, hot windstorms that blasted its surface into fantastic spires, rounded escarpments, and tunneled hillsides. The atmosphere boiled away long ago, leaving an airless rock with no water or life. The Azteca view this planet as a mystic place because of the strange, unnerving formations so beautiful they seem sculpted by some alien aesthetic. It is said that there is not a single sharp edge on the planet.
Tlazolteotl (tla-zohl-TAY-ohtl): this planet has an orbit only slightly different than that of Paynal, and the two probably once shared a binary orbit. The two in fact regularly switch orbits as they travel around Tonatiu. Tlazolteotl has a rarified atmosphere that does little but support fantastic electrical storms that rarely drop moisture onto the parched surface below. Besides tiny ice caps, all of the planet's moisture resides in a few whispy clouds in its atmosphere, and heat lightnings keep even the night side of the planet well lit.
Tamoachan (tah-moh-AH-chahn): the home planet of the Azteca. This planet resides on the inside of the system's habitable zone, making it hot, but bearable. The current gravity tug-of-war going on in the system keeps Tamoachan's fiery interior from settling down, and vulcanism is common.
Huixtocihuatl (weesh-toh-KEE-wahtl): this glacial planet lies far away from the heat sources of the solar system. Its immense oceans have not melted since the planet first hardened into solidity. The planet has no atmosphere, but occasional planetary stresses and tugs of the gravity war have created incredible cracks and crevices in the iceball. Immense canyons, miles deep and wide, crisscross the surface and glaciers clash against each other creating "mountain ranges" of ice.
Xolatl (SHOH-lahtl): this planet was once a gas giant of enormous size. In fact, it verged on being the third sun of this system. The planet reached a point in mass where it collapsed inward, trying to ignite the nuclear fires necessary to become a sun. For a brief moment it succeeded, but the fires were quickly quenched as soon as they began and the planet cooled quickly. The heavy metals and minerals hardened and the planet became a glistening metal sphere in space. Now that Ixtlanticutli is vying for possession of the planet, gravitational stresses have warmed the planet again and its core is boiling. Vulcanism has begun again, and metals with lower boiling points began to run freely over the other metals. Soon, boiling oceans of metal-filled cavities stood between still-solid shores, and noxious vapors created an atmosphere of sorts. Earthquakes are common, and volcanic eruptions almost continuous.
Huahuantli (wah-WAHN-tlee): this methane monster circles the large red giant Ixtlanticutli. It is large enough to hold over 50 Tamoachans and keeps sixteen moons captive, despite the pull of the red star. Little is known of its interior because its intense gravity has destroyed every probe (and warrior) sent to find out more about it. Its bands of green, black, and red make this planet ominous in appearance. The sixteen moons are visited regularly by the city-states of Tamoachan to pay obesience to the red sun which they believe to be the origin of all fire in the universe. Some of the smaller moons are dedicated to rituals attended by all city-states, and no territorial claims are recognized on them. They are often used as sites for the mediation of conflicts and discussion of strategy against the Empire's enemies.
Ehecalli (eh-HEY-ca-li): there are five stable Lagrange points in the Tamoachan system, and each has accumulated its share of asteroids. These have become the homes of the Chichimeca.