No fancy name. No Latin god of war. Japanese months are just numbers: 1月, 2月, 3月. Brutally practical. But the character that makes it work, 月 (gatsu), is anything but simple. 月 is a pictogram of the crescent moon. The Shuowen Jiezi calls it "the essence of the great yin": the celestial body that fills and empties, appears and disappears. Twelve lunar cycles make a year, so 月 means both "moon" and "month. " Every time you say sangatsu (3月), you're counting moons.