Three enclosures (三垣, pinyin: Sān Yuán) are Purple Forbidden enclosure (紫微垣), Supreme Palace enclosure (太微垣), and Heavenly Market enclosure (天市垣) in Chinese constellation. Hanyu Pinyin (Simplified Chinese: ; Traditional Chinese: ; pinyin: ), commonly called Pinyin, is the most common variant of Standard Mandarin romanization system in use. ... Chinese constellations are different from the western constellations, due to the independent development of ancient Chinese astronomy. ...