Nutze Skyfield fuer praezisere Daemmerungsberechnung

public/py/vendor/skyfield/descriptorlib.py

@@ -0,0 +1,14 @@
+from functools import update_wrapper
+
+class reify(object):
+    """Adapted from Pyramid's `reify()` memoizing decorator."""
+    def __init__(self, method):
+        self.method = method
+        update_wrapper(self, method)
+
+    def __get__(self, instance, objtype=None):
+        if instance is None:
+            return self
+        value = self.method(instance)
+        instance.__dict__[self.__name__] = value
+        return value