diff --git a/docs/lib-sphere_spiral.md b/docs/lib-sphere_spiral.md
index 80ec42ee..9b776716 100644
--- a/docs/lib-sphere_spiral.md
+++ b/docs/lib-sphere_spiral.md
@@ -9,8 +9,8 @@ Creates all points and angles on the path of a spiral around a sphere. It return
 - `z_circles` : The spiral rotates around the z axis. This parameter determines how many circles it will rotate from the top to the end. It defaults to 1.
 - `begin_angle` : The default value is 0 which means begins from the north pole of the sphere. See examples below.
 - `end_angle` : The default value is 0 which means begins from the sourth pole of the sphere. See examples below.
-- `vt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
-- `rt_dir` : `"SPI_DOWN"` for spiraling down. `"SPI_UP"` for spiraling up. The default value is `"SPI_DOWN"`.
+- `vt_dir` : `"SPI_DOWN"` for spiraling down. `"SPI_UP"` for spiraling up. The default value is `"SPI_DOWN"`.
+- `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
 
 ## Examples
     
diff --git a/src/sphere_spiral.scad b/src/sphere_spiral.scad
index 0b82a172..375ba450 100644
--- a/src/sphere_spiral.scad
+++ b/src/sphere_spiral.scad
@@ -13,12 +13,12 @@
 *
 **/ 
 
-function sphere_spiral(radius, za_step, z_circles = 1, begin_angle = 0, end_angle = 0, vt_dir = "CT_CLK", rt_dir = "SPI_DOWN") = 
+function sphere_spiral(radius, za_step, z_circles = 1, begin_angle = 0, end_angle = 0, vt_dir = "SPI_DOWN", rt_dir = "CT_CLK") = 
     [
         for(a = [begin_angle:za_step:90 * z_circles - end_angle]) 
             let(
-                ya = rt_dir == "SPI_DOWN" ? (-90 + 2 * a / z_circles) : (90 + 2 * a / z_circles),
-                za = (vt_dir == "CT_CLK" ? 1 : -1) * a,
+                ya = vt_dir == "SPI_DOWN" ? (-90 + 2 * a / z_circles) : (90 + 2 * a / z_circles),
+                za = (rt_dir == "CT_CLK" ? 1 : -1) * a,
                 ra = [0, ya, za]
             )
             [rotate_p([radius, 0, 0], ra), ra]