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Spring Festival is the first traditional festival for the Chinese people. In the past years, Spring Festival was called “new year”, for this day was the first day of the lunar month according to the lunar calendar which had long been used in China, so it was the beginning of a new year. It is recorded that Chinese people have celebrated Spring Festival for more than 4000 years, which was started by Yu Shun. One day as far back as 2000 B.C, Shun was inaugurated as the emperor. He led his men to hold a ceremony in honor of Heaven and Earth. From then on, people saw that day as the beginning of the year, i.e. the first day of the lunar month. This is said to be the origin of the lunar new year, which was called Spring Festival later. After the Revolution of 1911, China began to number the years according to the Gregorian calendar, and it was then that the lunar new year began to be called Spring Festival.
Measurement, which is called metrology in ancient times, is the important foundation of social development of the modern countries’ economy, science and technology. It has a long history and plays an important role in national welfare and the people's livelihood. Established in 221 BC, in the Qin dynasty, Qinshihuang unified weights and measures, and became a unified system for the measurement of milestone in ancient China. On May 20th, 1875, the signing of the convention on metric, opened up a worldwide to implement new era of modern international system of units of measurement. Based on quantum physics, research and application of modern measurement science and technology, provides more accurate modern metrology technical support for the development of human civilization. In 1999, the 21st international conference on measurement made a decision that since 2000, May 20 is for "World Metrology Day". China's propaganda theme of 2015 is in line with international theme for "measurement and light".