There are many records in the ancient Chinese books, most of these are records of two sun appeared together, in some occasions, more than two suns, even as many as 10 suns; Other strange phenomenons like one sun appears at night, or two suns clashing each other, one big and one small.
Below are quotations from Chinese Classics and history annals, with a brief translation, to keep the original text for the purpose of authenticity, and waiting further research of Chinese historians and astronomers.
Year 1914 BC, Ten suns appeared together. This strange phenomenon also recorded in another book, Bamboo Annals.
Year 1042 BC, the 48th year of Emperor Xin of Yin (the notorious tyrant king Zhou) dynasty, two sun appeared together. 4 years later, the Martial King of Zhou began the punitive expedition against Yin.
Year 139 BC, the fourth month, a sun-like star appeared in the evening.
the first month of the fifth Year, three suns appeared on the sky.
Year 318, eleventh month, the sun rise up during the night, 3 Zhangs above the horizon.
Year 520, sun appeared on the eastern sky in the night, as bright as fire.
In year 809, the third month, beside sun appeared an object looks like a sun.
Yuan dynasty, year 1356, the third month, two sun clashing each other.
Year 1594, in the area of Jijiang, another sun under the sun, clashing many days then stopped.
Year 1621, in the area of Liao Yang, several suns appeared together.
The latest recorded in Qing dynasty, year 1651, at round 23PM-1AM, red sun appeared in the eastern sky, as big as Hu (a measure tool), at the midnight, the moon rose, then the sun disappeared.
A Chinese saying, No two suns on the sky, no two emperors on the earth, this might be wrong, and the return of the second sun, even the third, unto ten suns, the tens sun appeared on the sky might be not just a fantasy myth.