Nebula A "guest star" was seen by the Chinese in 1054. The supernova explosion was witnessed in the area of Earth's sky where today we see an expanding gas cloud that we call Crab Nebula. The "guest star" was so bright it was visible in daylight. The most dramatic supernova was observed in the year 1006 AD. It appeared in May as a brilliant point of light visible during the day. It was bright enough to cast …showed first 75 words of 480 total…

…showed last 75 words of 480 total…two components: celestial stem, terrestial stem Thus, the 1st year of the 60-year cycle becomes jia-zi, the 2nd year is yi-chou, the 3rd year is bing-yin, etc. When we reach the end of a component, we start from the beginning: The 10th year is gui-you, the 11th year is jia-xu (restarting the Celestial Stem), the 12th year is yi-hai, and the 13th year is bing-zi (restarting the Terrestrial Branch). Finally, the 60th year becomes gui-hai.