Mars (火星; Star of Fire) is the fourth planet from the Sun in this Solar System. It has two moons, Phobos and Deimos.
In the Sailor Moon series, Mars was protected by Sailor Mars, even though in the present she resided on Earth with the other Sailor Senshi of the system. Her guardian crows, Phobos and Deimos, were named for Mars' moons, but came from the planet Coronis.
In the manga and Sailor Moon Crystal, Phobos Deimos Castle orbited Mars, and was the palace of Princess Mars. The Sailor Crystal associated with her planet was the Mars Crystal.
In Roman mythology, Mars, also known as Ares in the Greek pantheon, was the god of war. He was the son of Juno and Jupiter.
In Western astrology, Mars is traditionally associated with willpower, aggressiveness, strength, and conflicts. A person with Mars dominating in their natal chart is supposed to be headstrong, combative, and quick to pick fights, similar to Sailor Mars. The qualitative opposite of Mars is Venus. Mars is associated with Tuesday. Dante Alighieri associated Mars with the liberal art of arithmetic.
In Chinese astrology, Mars is ruled by the element fire. In Indian astrology, Mars represents energy, confidence, and ego.
- In the Japanese calendar, Tuesday is called "kayoubi" (火曜日), meaning "the day of fire."
- The month of March is named for Mars.