Nutze Skyfield fuer praezisere Daemmerungsberechnung

public/py/vendor/skyfield/data/stellarium.py

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+"""Parse Stellarium data files."""
+
+from collections import namedtuple
+
+StarName = namedtuple('StarName', 'hip name')
+
+def parse_constellations(lines):
+    """Return a list of constellation outlines.
+
+    Each constellation outline is a list of edges, each of which is
+    drawn between a pair of specific stars::
+
+        [
+            (name, [(star1, star2), (star3, star4), ...]),
+            (name, [(star1, star2), (star3, star4), ...]),
+            ...
+        ]
+
+    Each name is a 3-letter constellation abbreviation; each star is an
+    integer Hipparcos catalog number.  See :ref:`neowise-chart` for an
+    example of how to combine this data with the Hipparcos star catalog
+    to draw constellation lines on a chart.
+
+    """
+    constellations = []
+    for line in lines:
+        line = line.lstrip()
+        if line.startswith(b'#'):
+            continue
+        fields = line.split()
+        if not fields:
+            continue
+        name = fields[0]
+        edges = [(int(fields[i]), int(fields[i+1]))
+                 for i in range(2, len(fields), 2)]
+        constellations.append((name.decode('utf-8'), edges))
+    return constellations
+
+def parse_star_names(lines):
+    """Return the names in a Stellarium ``star_names.fab`` file.
+
+    Returns a list of named tuples, each of which offers a ``.hip``
+    attribute with a Hipparcos catalog number and a ``.name`` attribute
+    with the star name.  Do not depend on the tuple having only length
+    two; additional fields may be added in the future.
+
+    """
+    names = []
+    for line in lines:
+        line = line.strip()
+        if line == b'' or line.startswith(b'#'):
+            continue
+        fields = line.split()
+        hip, name = fields[0].split(b'|')
+        names.append(StarName(
+            int(hip),
+            name.strip(b'_(")').decode('utf-8'),
+        ))
+    return names