fix zenith plot star size calc (#29)

Author: steveberardi

src/starplot/__init__.py

@@ -1,6 +1,6 @@
 """Star charts and maps"""
 
-__version__ = "0.3.1"
+__version__ = "0.3.2"
 
 from .base import StarPlot  # noqa: F401
 from .zenith import ZenithPlot  # noqa: F401

src/starplot/zenith.py

@@ -165,9 +165,10 @@ def _plot_stars(self):
         for m in stardata["magnitude"][bright_stars]:
             if m < 2:
                 sizes.append((8 - m) ** 2.56 * (self._size_multiplier**2))
+            elif m < 8:
+                sizes.append((8 - m) ** 1.38 * (self._size_multiplier**2))
             else:
-                # sizes.append((1 + self.limiting_magnitude - m) ** 2 * self._size_multiplier)
-                sizes.append((8 - m) ** 1.36 * (self._size_multiplier**2))
+                sizes.append(self._size_multiplier**2)
 
         # Draw stars
         if self.style.star.marker.visible: