The Purple Forbidden enclosure (紫微垣 Zǐ wēi yuán) is one of the San Yuan (三垣 Sān yuán) or Three Enclosures. Stars and constellations of this group lie near the north celestial pole and are visible all year from temperate latitudes in the Northern Hemisphere.
Asterisms
The asterisms are :
References
Purple Forbidden enclosure Wikipedia(Text) CC BY-SA