Japan is called the "land of the rising sun" primarily because of its geographical location east of China. From China's perspective, the sun appears to rise in the direction of Japan.
Here's a more detailed explanation:
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Geographical Perspective: Ancient China, being a major cultural and geographical reference point in East Asia, observed the sunrise relative to its location. Japan lies to the east of China, making it the direction from which the sun seemed to emerge each day.
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Japanese Name - Nihon/Nippon: The Japanese themselves refer to their country as "Nihon" or "Nippon." These names literally translate to "sun origin" or "source of the sun." This reinforces the idea of Japan being the place where the sun originates.
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Symbolism: The rising sun has become a powerful symbol of Japan, featured prominently on the national flag (a red disc representing the sun) and other national emblems. This symbol reflects the country's identity and its place in the world.
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Historical Context: The term and the concept likely originated and spread during a time when East Asian countries were establishing diplomatic and cultural relations. The phrase "land of the rising sun" was likely adopted by other nations to describe Japan based on the geographical perspective and the country's self-identification.
In summary, Japan is known as the "land of the rising sun" due to its location east of China, making it appear as the origin of the sun from a Chinese viewpoint, a notion solidified by the Japanese name for their country: Nihon/Nippon, meaning "sun origin."