Rain has always been an important factor for those communities that rely on rainwater and water in general for their livelihood, such as gardeners and farmers. In ancient times, the amount of rain was important to know how moist the soils were and from this they could estimate how good their crops would be. Measure Rainfall were found in ancient Chinese government records as early as the Chou dynasty, more than 3,000 years ago. Records have also been found in Greece and India at about 400 to 500 B.C. The best records in pre-modern times however, were kept in Korea. King Sejong wanted to improve agricultural technology and his son, who was to become King Munjong, invented a rain gauge in the 1400s. A rain gauge was sent to each village and used to assess the village’s potential harvest from the rainfall, which in turn determined how much the village should be taxed.