Tai Sui (太岁) refers to the Grand Duke of Jupiter in Chinese Metaphysics. It changes its position in the Chinese zodiac every year, moving from one animal sign to the next in a 12-year cycle. Tai Sui is said to influence the energy and affairs of that particular year and the individuals born during that year. Understanding the position of Tai Sui is crucial for making informed decisions and navigating challenges in Feng Shui and Chinese astrology.