Note 13 — Chapter XXXIII

The 28

sieu

or stellar spaces, above spoken of, do not extend to the Pole; they are indeed very unequal in extent on the meridian as well as on the equator. And the area in the northern sky not embraced in them is divided into three large spaces called

Yuen

or enclosures, of which the field of circumpolar stars (or circle of perpetual apparition) forms one which is called

Tze-Wei

. (

Williams

.)

The southern circumpolar stars form a fourth space, beyond the 28 sieu. Ibid.