(85,45)    90     (85,135)
      +--------|--------+
      |        | North   |
      |        | Pole    |
      |        | /       |
0/360 +--------0--------+ 180
      |        |         |
      |        |         |
      |        |         |
      +--------|--------+
   (85,315)   270     (85,225)

##</code><code>##

nnn-a, 85, 90, 0, 180
nnn-b, 85, 90, 180, 360