After the down fall of the Tibetan Dynasty, Tibet became chaotic, and the transmissions of the Han calendars stopped, Tibetan were left without a scientific calendar until 11th century.

• 在西藏王朝没落后，西藏变得混乱起来，而汉历法的传播就终止了，西藏就失去了科学历法直到11世纪为止。