Bucha Day Is known as a "Day of the Book" and "clergy" because it is the day that Lord Buddha preached the sermon of Thammachak. For the first time the disciples and was born a priest at the Holy Triple Gem is the first in the world.
Day name is also called "the nature" and "the monk" since it was the day of Buddha had shown the first sermon announced พระธรรมจักร. For the first time to the presentment .And the day is born with all the complex world first monks .