STC-1.33 Erratum 2:

Section 4.5.1.4 (pg 30-31: Region.Polygon) states:"The inside of the region is defined as that part of coordinate space that is encircled by the polygon in a counter-clockwise sense. What this means is that, in a plane, if A > 0, the “inside” of the polygon is included; if A < 0, the “outside” is selected. On a sphere with a left-handed (celestial) coordinate system, if A > 0, one has identified the inside of the polygon; if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A
The incorrect text is shown in bold text:
This is also wrong because if A < 0 then 4*pi – A is > 4*pi, and that cannot be.
The correct text is:
"if A < 0, one used the “outside” angles of the polygon and the area is really 4π + A

Original Wording

• Section 4.5.1.4 (pg 30-31: Region.Polygon) : if A < 0, one used the “outside” angles of the polygon and the area is really 4π − A .