Excel rotate radar chart

Question

I have been trying to create a windrose that displays the occurence of multiple wind speeds and their respective wind direction. Using other very helpful posts on here I've gotten pretty close to what I want. There is just one thing I can't seem to fix.

As you can see in the figure below the graph starts at 0 degrees while I want the "North" wind direction to start at -11,25 (or +348,75) degrees.

Currently the radial axis labels are added using a pie chart while the rest of the data is plotted in a filled radar chart. It is easy to rotate the pie chart but I can't seem to find a similar function for rotating the radar chart. Any help would be much appreciated. The excel file is attached beneath the figure.

EDIT: Locked excel file against editing

Excel file

Answer 1

I haven't fully digested the netiquette of this website and not sure if it is a good idea to try giving you an answer 6+ months after you posted. Also hope that by this time you found an answer.

If not, this link should be of help: https://superuser.com/questions/687036/how-to-make-a-pie-radar-chart

In the example the creator made one field for each degree and started the first series, which would be equivalent to your north at 0°. However nothing prevents you from starting at 348. I have not tested but I also think that nothing prevents you from adding even more "resolution", e.g. half-degree steps.. or even more to your discretion.

EDIT: following L.Guthardt's feedback. In order to provide you an answer I opted to simplify your table and chart. Mostly for convenience, but also because I struggle to get a full understanding of the original "architecture". Still, the solution should work at any level and is based on two key elements:

first you will have to double the number of rows from 16 to 32 (thus each quadrant being repeated two times, e.g. ... nne - nne - ne - ne...)

second, you have to start and finish with N as showcased here

Direction   Cat6            

N       6           
NNE     4   4       
NNE         6       
NE          4   4   
NE              6   
ENE             4   4
ENE                 6
E       4           4
E       6           
ESE     4   4       
ESE         6       
SE          4   4   
SE              6   
SSE             4   4
SSE                 6
S       4           4
S       6           
SSW     4   4       
SSW         6       
SW          4   4   
SW              6   
WSW             4   4
WSW                 6
W       4           4
W       6           
WNW     4   4       
WNW         6       
NW          4   4   
NW              6   
NNW             4   4
NNW                 6
N       4           4

which will generate

for the pie chart I used a separate range with alternate gaps in the labels

Direction   Dummy
N   1
    1
NNE 1
    1
NE  1
    1
ENE 1
    1
E   1
    1
ESE 1
    1
SE  1
    1
SSE 1
    1
S   1
    1
SSW 1
    1
SW  1
    1
WSW 1
    1
W   1
    1
WNW 1
    1
NW  1
    1
NNW 1
    1