Nutze Skyfield fuer praezisere Daemmerungsberechnung

public/py/vendor/sgp4/api.py

@@ -0,0 +1,27 @@
+"""Public API that tries to import C++ module, but falls back to Python."""
+
+__all__ = (
+    'SGP4_ERRORS', 'Satrec', 'SatrecArray', 'WGS72OLD', 'WGS72', 'WGS84',
+    'accelerated', 'jday', 'days2mdhms',
+)
+
+from .functions import jday, days2mdhms
+
+SGP4_ERRORS = {
+    1: 'mean eccentricity is outside the range 0.0 to 1.0',
+    2: 'nm is less than zero',
+    3: 'perturbed eccentricity is outside the range 0.0 to 1.0',
+    4: 'semilatus rectum is less than zero',
+    5: '(error 5 no longer in use; it meant the satellite was underground)',
+    6: 'mrt is less than 1.0 which indicates the satellite has decayed',
+}
+
+try:
+    from .wrapper import Satrec, SatrecArray
+    accelerated = True
+except ImportError:
+    from .model import Satrec, SatrecArray
+    from .model import WGS72OLD, WGS72, WGS84
+    accelerated = False
+else:
+    from .vallado_cpp import WGS72OLD, WGS72, WGS84