Always use centre alignment for polar theta ticks.

QuLogic · QuLogic · commit c8dd52390603 · 2017-11-29T05:42:09.000-05:00
Because of the resetting and the ways tick anchoring worked, this was
effectively how it worked anyway.
diff --git a/lib/matplotlib/projections/polar.py b/lib/matplotlib/projections/polar.py
@@ -888,16 +888,10 @@ def get_xaxis_transform(self, which='grid'):
         return self._xaxis_transform
 
     def get_xaxis_text1_transform(self, pad):
-        if _is_full_circle_rad(*self._realViewLim.intervalx):
-            return self._xaxis_text_transform, 'center', 'center'
-        else:
-            return self._xaxis_text_transform, 'bottom', 'center'
+        return self._xaxis_text_transform, 'center', 'center'
 
     def get_xaxis_text2_transform(self, pad):
-        if _is_full_circle_rad(*self._realViewLim.intervalx):
-            return self._xaxis_text_transform, 'center', 'center'
-        else:
-            return self._xaxis_text_transform, 'top', 'center'
+        return self._xaxis_text_transform, 'center', 'center'
 
     def get_yaxis_transform(self, which='grid'):
         if which in ('tick1', 'tick2'):
