日心说 Traditional form: 日心說 Pinyin (reading): rìxīnshuō Definitions: heliocentric theory the theory that the sun is at the center of the universe Characters: 日 - sun; day; daytime 心 - heart; mind; soul 说 - to speak, to say; to scold, to upbraid Traditional characters: 日 - sun; day; daytime 心 - heart; mind; soul 說 - to speak, to say; to scold, to upbraid