Nutze Skyfield fuer praezisere Daemmerungsberechnung

2026-07-13 19:35:39 +02:00
parent dc5292735f
commit 97357a88e0
1092 changed files with 370248 additions and 61 deletions
@@ -0,0 +1,109 @@
+# Test the behavior of all combinations of vector.
+
+from assay import assert_raises
+from skyfield.api import Topos, load
+from skyfield.positionlib import Geocentric
+
+def test_bad_addition():
+    planets = load('de421.bsp')
+    earth = planets['earth']
+    mars = planets['mars']
+    with assert_raises(ValueError, 'the center where the other vector starts'):
+        earth + mars
+
+def test_bad_subtraction():
+    planets = load('de421.bsp')
+    earth = planets['earth']
+    usno = Topos('38.9215 N', '77.0669 W', elevation_m=92.0)
+    with assert_raises(ValueError, 'if they both start at the same center'):
+        earth - usno
+
+def test_chebyshev_subtraction():
+    planets = load('de421.bsp')
+    v = planets['earth barycenter'] - planets['sun']
+
+    assert str(v) == """\
+Sum of 2 vectors:
+ Reversed 'de421.bsp' segment 10 SUN -> 0 SOLAR SYSTEM BARYCENTER
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER"""
+
+    assert repr(v) == """\
+<VectorSum of 2 vectors:
+ Reversed 'de421.bsp' segment 10 SUN -> 0 SOLAR SYSTEM BARYCENTER
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER>"""
+
+def test_negation():
+    ts = load.timescale()
+    t = ts.utc(2020, 8, 30, 16, 5)
+    usno = Topos('38.9215 N', '77.0669 W', elevation_m=92.0)
+    neg = -usno
+    p1 = usno.at(t)
+    p2 = neg.at(t)
+    assert (p1.xyz.au == - p2.xyz.au).all()
+    assert (p1.velocity.au_per_d == - p2.velocity.au_per_d).all()
+
+    # A second negation should return the unwrapped original.
+    neg = -neg
+    assert neg is usno
+
+def test_vectors():
+    ts = load.timescale()
+    t = ts.tt(2017, 1, 23, 10, 44)
+
+    planets = load('de421.bsp')
+    earth = planets['earth']
+    mars = planets['mars']
+
+    v = earth
+
+    assert str(v) == """\
+Sum of 2 vectors:
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH"""
+
+    assert repr(v) == """\
+<VectorSum of 2 vectors:
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH>"""
+
+    assert str(v.at(t)) == "\
+<Barycentric BCRS position and velocity at date t center=0 target=399>"
+
+    v = earth + Topos('38.9215 N', '77.0669 W', elevation_m=92.0)
+
+    assert str(v) == """\
+Sum of 3 vectors:
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH
+ Geodetic 399 EARTH -> IERS2010 latitude +38.9215 N longitude -77.0669 E elevation 92.0 m"""
+
+    assert repr(v) == """\
+<VectorSum of 3 vectors:
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH
+ Geodetic 399 EARTH -> IERS2010 latitude +38.9215 N longitude -77.0669 E elevation 92.0 m>"""
+
+    assert str(v.at(t)) == """\
+<Barycentric BCRS position and velocity at date t center=0 target=IERS2010 latitude +38.9215 N longitude -77.0669 E elevation 92.0 m>"""
+
+    v = earth - mars
+
+    assert str(v) == """\
+Sum of 4 vectors:
+ Reversed 'de421.bsp' segment 499 MARS -> 4 MARS BARYCENTER
+ Reversed 'de421.bsp' segment 4 MARS BARYCENTER -> 0 SOLAR SYSTEM BARYCENTER
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH"""
+
+    assert repr(v) == """\
+<VectorSum of 4 vectors:
+ Reversed 'de421.bsp' segment 499 MARS -> 4 MARS BARYCENTER
+ Reversed 'de421.bsp' segment 4 MARS BARYCENTER -> 0 SOLAR SYSTEM BARYCENTER
+ 'de421.bsp' segment 0 SOLAR SYSTEM BARYCENTER -> 3 EARTH BARYCENTER
+ 'de421.bsp' segment 3 EARTH BARYCENTER -> 399 EARTH>"""
+
+    assert str(v.at(t)) == "\
+<ICRF position and velocity at date t center=499 target=399>"
+
+    geocentric = Geocentric([0,0,0])
+    assert geocentric.center == 399