Four Seasons Description of Stargazing Observatory

On the stargazing platform, there is also a "viewing platform", which was built by Zhou Wenwang's fourth son, Ji Dan. It is an instrument for ancient ancestors to measure the shadow of the sun and verify the four seasons. After the demise of the Shang Dynasty, the Zhou Dynasty was established. As the saying goes, "He who wins the Central Plains wins the world". So the Zhou Dynasty wanted to build its capital in the Central Plains, which is now Luoyang. In order to meet the needs of political rule and find accurate astronomical basis for Luoyang, the capital of the East, Duke Ji Dan of Zhou built the "Moon Watching Platform". China's traditional solar terms are divided into four days: winter, summer, vernal equinox and autumnal equinox, which were determined by Zhou's on-the-spot observation on the observation platform, thus determining the four seasons of spring, summer, autumn and winter.