續一切經音義 6.215

6.215

鎮星（中央土之精也一名地侯徑五十里其色黃其行遲二十九年一周天下星字說文從晶作曐云萬物之精也古文作𠻖像形也晶音精亦精光也）。

鎮星 (The essence of Earth in the center. Another name is Dihou. Its diameter is fifty li; its color is yellow. Its motion is slow, taking twenty-nine years to complete one circuit of heaven. As for the character xing [‘star’] below: the Shuowen writes it with jing as 曐, saying it is the essence of the myriad things. In the ancient script it is written as 𠻖, depicting its form. Jing is pronounced jing, meaning pure radiance.)