How to use one value node to control the z rotation of 2 mapping nodes?

I need one of the mapping nodes to always be the same as the other one but with 15 degrees added to it.

I have tried taking the generated texture coordinates and separating the xyz values and plugging the x and y into a combine xyz node and plugging the value node into the z then connect the combine xyz node to the rotation plug of the mapping node. Unfortunately it seems the value is not being interpreted as “degrees”.

The math node now has a To Radians operator. Try using that. If it doesn’t do what you want, show the node setup.

Or just use radians 15 degrees would be .261799 radians

Pi (3.14 etc) radians is 180 degrees. So 15 degrees is Pi/12 radians. (You can just type “pi” in a value or math node if you want.)