| The ratio customarily used to make the National flag of Japan is 7:10 and the sun in center is three fifth of the length, mainly the pre-war generations memorize the ratio as 'shichi-go-san' when they made the flag themselves. |
日本の国旗で慣例的に用いられる縦横比が710、日章の直径は縦の5分の3のため、主に戦前の世代では国旗を自作するにあたってその比率を「七五三」と覚えたという。 |