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This blog shares ideas, technologies, and educational content to inspire the world,
under the slogan: "present to the world – idea.tech.learn.impact".

Author: pre2w  
Topics: Tech, Science, Education, Blogging Tips, and insights for a better future


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Redefining the Sky of Joseon – The Scientific Brilliance of Chiljeongsan Naeoe-pyeon

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  Redefining the Sky of Joseon – The Scientific Brilliance of Chiljeongsan Naeoe-pyeon (from Volume 156 of the Veritable Records of King Sejong) During the Goryeo Dynasty, Choi Seongji accompanied King Chungseon on a visit to the Yuan Dynasty in China. There, he obtained a copy of the Shoushili Calendar (授時曆法) and brought it back to Korea, where it was adopted for the first time. However, at the time, local calendar officials only understood how to construct the calendar itself. They lacked the knowledge to calculate solar and lunar eclipses or determine the positions of the five planets—Mercury, Venus, Mars, Jupiter, and Saturn. In response, King Sejong commissioned Jeong Heumji, Jeong Cho, and Jeong Inji to conduct astronomical research and refine the calendar system. These scholars successfully unraveled the underlying principles. Where their understanding fell short, King Sejong himself, with his keen insight, discerned the correct interpretations. Moreover, the Joseon cou...
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Korea’s Unique Age Culture: Why Do Koreans Ask Your Age?

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  Korea’s Unique Age Culture: Why Do Koreans Ask Your Age? One of the most common questions foreigners hear when they first arrive in Korea is: “How old are you?” At first, it may seem like a simple question born out of curiosity or small talk. However, this question carries a deeper cultural significance in Korean society, rooted in language, respect, and social structure. Korea’s Unique Age Culture: Why Do Koreans Ask Your Age? 1. In Korea, Age Defines Relationships In Korean culture, age is far more than just a number. It determines how people speak to each other, address one another, and even how they behave in social situations. The use of honorific or informal language is based on age difference. Titles like oppa (older brother), noona (older sister), hyung , and unni are assigned based on relative age. Traditional etiquette such as allowing the eldest to eat first is still commonly observed. Knowing someone’s age helps define the relationship and the ap...
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Gyeongbokgung Palace, Korea: 2025 Visitor Information

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  Gyeongbokgung Palace, Korea: 2025 Visitor Information Gyeongbokgung Palace is one of South Korea's most iconic landmarks , representing the nation's rich history and cultural heritage. Built in 1395 during the reign of King Taejo, it served as the main royal palace of the Joseon Dynasty . Despite suffering destruction during historical conflicts, extensive restoration efforts since the 1990s have helped preserve its grandeur. Gyeongbokgung Palace, the main royal palace of the Joseon Dynasty in South Korea Located in Jongno-gu, Seoul, South Korea , the palace is easily accessible via Gyeongbokgung Station (Line 3) and Gwanghwamun Station (Line 5) . General Information Category Details Location Seoul, South Korea Opening Hours January–February: 09:00–17:00 / March–May: 09:00–18:00 / June–August: 09:00–18:30 / September–October: 09:00–18:00 / November–December: 09:00–17:00 Closed Days Every Tuesday Contact +82-2-3700-3900 Address 1-1 Sajik-ro, Jongno-gu, Seoul, South Korea Ho...
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