Chen Collection, Upper Volume Radical: Sun (rì) Entry: Bu Kangxi Strokes: 11 Page 496, Entry 02 Pronounced bu. According to the Extensive Rhyme (Guangyun), Collection of Rhymes (Jiyun), Collected Rhymes (Yunhui), and Correct Rhymes (Zhengyun), the pronunciation is bu. According to the Jade Chapters (Yupian), this refers to the period between 3:00 PM and 5:00 PM. Book of Former Han (Qianhan shu), Treatise on the Five Phases: When the solar eclipse occurs at noon from the northeast, passing the halfway point, it returns during the bu period. Huainanzi, Teachings on Astronomy: When the sun arrives at the Sorrowful Valley, this is called the bu period.