Update tests for impact angle

test/physics.jl

@@ -34,8 +34,8 @@ using Test
     @test 70311759.26448613 ≈ γs[1].t
     @test 70311759.59904088 ≈ γs[2].t
 
-    @test -0.98123942583677 ≈ γs[1].impact_angle
-    @test -0.6166369315726149 ≈ γs[2].impact_angle
+    @test 2.9475847709323384 ≈ γs[1].impact_angle
+    @test 2.2352599137868996 ≈ γs[2].impact_angle
 
     @test Direction(0.45964884122649263, -0.8001372907490844, -0.3853612055096594) ≈ γs[1].dir
     @test Direction(0.45652355929477095,-0.8025165828910586, -0.38412676812960095) ≈ γs[2].dir