Nutze Skyfield fuer praezisere Daemmerungsberechnung

2026-07-13 19:35:39 +02:00
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+"""Various constants required by Skyfield."""
+
+# Definitions.
+AU_M = 149597870700             # per IAU 2012 Resolution B2
+AU_KM = 149597870.700
+ASEC360 = 1296000.0
+DAY_S = 86400.0
+
+# Angles.
+ASEC2RAD = 4.848136811095359935899141e-6
+DEG2RAD = 0.017453292519943296
+RAD2DEG = 57.295779513082321
+pi = 3.141592653589793
+tau = 6.283185307179586476925287  # lower case, for symmetry with math.pi
+
+# Physics.
+C = 299792458.0                            # m/s
+GM_SUN_Pitjeva_2005_km3_s2 = 132712440042  # Elena Pitjeva, 2015JPCRD..44c1210P
+
+# Earth and its orbit.
+ANGVEL = 7.2921150e-5           # radians/s
+ERAD = 6378136.6                # meters
+IERS_2010_INVERSE_EARTH_FLATTENING = 298.25642
+
+# Heliocentric gravitational constant in meters^3 / second^2, from DE-405.
+GS = 1.32712440017987e+20
+
+# Time.
+T0 = 2451545.0
+B1950 = 2433282.4235
+
+C_AUDAY = C * DAY_S / AU_M