The Korean ancestors made many achievements in the astronomy sector.
Chiljongsan , a national classic, is a book describing the method of making a calendar. It was completed in 1442 and published in 1444.
Chiljong means the sun, moon, Mercury, Venus, Mars, Jupiter and Saturn in the classical documents.
The then scholars edited the book with an eye to making a calendar in conformity with the reality of the country, based on the elucidation of a law peculiar to the location and movements of celestial bodies.
The book, which comprehensively systematized the theory on the location and movements of celestial bodies, is divided into two chapters and every chapter is sub-divided into provisions.
It describes the method of deciding the number of days per month and 24 seasonal divisions of the year by the lunar calendar, the theory on the movements of the sun and the moon, the method of deciding time by means of stars, the method of deciding the length of day and night, the theory on forecasting the solar and lunar eclipses, the theory on the movements of planets, etc.
It is a valuable national classic that showcases the level of developed astronomy in the first half of the 15th century.
More From Naenara (En)
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
December 03, 2025
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
December 03, 2025
Kim Jong Un , general secretary of the Workers’ Party of Korea and president of the State Affairs of the Democratic People’s
The DPRK provides all conditions and environment necessary to respect the personality of the persons with disabilities and help
December 03, 2025
The DPRK provides all conditions and environment necessary to respect the personality of the persons with disabilities and help
Saja Falls flows down the Chilsong Valley of Mt Myohyang, a celebrated mountain in the DPRK. With a drop of 12.7m, the waterfall
December 03, 2025
Saja Falls flows down the Chilsong Valley of Mt Myohyang, a celebrated mountain in the DPRK. With a drop of 12.7m, the waterfall
Fairyland villages have been built at the Jangsan Farm of Ryongchon County and the Pihwa Farm of Chonma County in North Phyongan
December 03, 2025
Fairyland villages have been built at the Jangsan Farm of Ryongchon County and the Pihwa Farm of Chonma County in North Phyongan
The Lao embassy in the DPRK hosted a reception at the Taedonggang Diplomatic Club on December 1 on the occasion of the 50th
December 03, 2025
The Lao embassy in the DPRK hosted a reception at the Taedonggang Diplomatic Club on December 1 on the occasion of the 50th
Among Korean cultural heritage is a technique of making paints used to decorate and protect the wooden buildings. Such practice is
December 03, 2025
Among Korean cultural heritage is a technique of making paints used to decorate and protect the wooden buildings. Such practice is
New houses have been built at the Mangum Greenhouse Farm of the North Hwanghae Provincial Rural Economy Committee and the Yonyu
December 02, 2025
New houses have been built at the Mangum Greenhouse Farm of the North Hwanghae Provincial Rural Economy Committee and the Yonyu
Children in the DPRK are growing up healthily, enjoying tasty and nutritious dairy products provided by the government every day.
December 01, 2025
Children in the DPRK are growing up healthily, enjoying tasty and nutritious dairy products provided by the government every day.
The Saesol Farm in Munchon City and the Roun Farm in Chonnae County, Kangwon Province, the DPRK, have undergone big changes beyond
December 01, 2025
The Saesol Farm in Munchon City and the Roun Farm in Chonnae County, Kangwon Province, the DPRK, have undergone big changes beyond
New houses have been built at the Ryokpho Vegetable Farm in Ryokpho District and the Oryu Vegetable Farm in Sadong District, both
November 30, 2025
New houses have been built at the Ryokpho Vegetable Farm in Ryokpho District and the Oryu Vegetable Farm in Sadong District, both
The newly-built Pyongyang Schoolchildren’s Footwear Factory and the remodelled Pyongyang School Uniform Factory were inaugurated.T
November 30, 2025
The newly-built Pyongyang Schoolchildren’s Footwear Factory and the remodelled Pyongyang School Uniform Factory were inaugurated.T
The above-ground construction of the Tanchon port has been successfully completed in the DPRK. The respected Comrade Kim Jong Un
November 29, 2025
The above-ground construction of the Tanchon port has been successfully completed in the DPRK. The respected Comrade Kim Jong Un
A friendly match between the national women’s soccer teams of the DPRK and Russia took place at Kim Il Sung Stadium on November 27
November 29, 2025
A friendly match between the national women’s soccer teams of the DPRK and Russia took place at Kim Il Sung Stadium on November 27
Jonjin Senior Middle School, newly built as a comprehensive school in Rangnang District, Pyongyang Municipality, was inaugurated.
November 29, 2025
Jonjin Senior Middle School, newly built as a comprehensive school in Rangnang District, Pyongyang Municipality, was inaugurated.
The agricultural workers in Kumbu-ri of Sakju County and Tanghu-ri of Phihyon County in North Phyongan Province of the DPRK enjoy
November 29, 2025
The agricultural workers in Kumbu-ri of Sakju County and Tanghu-ri of Phihyon County in North Phyongan Province of the DPRK enjoy
The scientists of the Academy of Agricultural Science have newly established a regenerated rice cultivation technology. The new
November 28, 2025
The scientists of the Academy of Agricultural Science have newly established a regenerated rice cultivation technology. The new
Last month a light-industry goods exhibition “Development of Light Industry-2025” was held in Pyongyang. A wide list of goods
November 28, 2025
Last month a light-industry goods exhibition “Development of Light Industry-2025” was held in Pyongyang. A wide list of goods
Professor Pak Hyong Sop, PhD, is credited with teaching and studying the traditional Korean music. The candidate academician works
November 28, 2025
Professor Pak Hyong Sop, PhD, is credited with teaching and studying the traditional Korean music. The candidate academician works
Proud entities of rural rejuvenation have been spruced up one after another in North Hamgyong Province of the DPRK under the care
November 28, 2025
Proud entities of rural rejuvenation have been spruced up one after another in North Hamgyong Province of the DPRK under the care
More Articles
