code: public final boolean inSector(Angle start, Angle end)
      {
          if (start.clockwise(end))
          {
              return !clockwise(start) && clockwise(end);
          }
          else
          {
              return clockwise(start) && !clockwise(end);
          }
      }
docs: Sector is less than 180 degrees delimited by start and end
  @param start
  @param end
  @return If this is between start - end