Circle or Square equals earth

[Shelley]

A quick question, I hope, I always thought the circle in the square represented earth and heaven. Earth represented by the circle and heaven by the square. But I have done some research and it seems its the other way round. 

 

The circle is heaven surrounded by earth represented by the square.

 

Can anyone put me straight?

 

Thank you.

 

[Jim]

There's this: https://baike.baidu.com/item/盖天说 

Quote

早期的盖天说是认为天圆地方的，认为“天圆如张盖，地方如棋局”

 

[Shelley]

That makes sense, its a dome not just a flat circle, so its the dome of heaven or the sky. The land is like a chess board, made/altered by man.

Thanks @Jim