diff --git a/cli.py b/cli.py
index 1500b54..5a501bb 100644
--- a/cli.py
+++ b/cli.py
@@ -1,4 +1,7 @@
 import argparse
+from math import pi, sqrt
+
+from scipy.constants import G, astronomical_unit
 
 from CustomScaler import CustomScaler
 from interpolators.rbf import RbfInterpolator
@@ -7,19 +10,63 @@ from simulation_list import SimulationList
 parser = argparse.ArgumentParser(description="interpolate water retention rate using RBF",
                                  epilog="returns water retention fraction and mass_retention fraction seperated by a newline")
 requiredNamed = parser.add_argument_group('required named arguments')
-requiredNamed.add_argument("-a", "--alpha", type=float, required=True, help="the impact angle")
+requiredNamed.add_argument("-a", "--alpha", type=float, required=True, help="the impact angle [degrees]")
 requiredNamed.add_argument("-v", "--velocity", type=float, required=True,
-                           help="the impact velocity in units of mutual escape velocity")
-requiredNamed.add_argument("-mp", "--projectile-mass", type=float, required=True, help="mass of the projectile [kg]")
-mass_or_gamma = requiredNamed.add_mutually_exclusive_group(required=True)
-mass_or_gamma.add_argument("-mt", "--target-mass", type=float, help="mass of the projectile [kg]")
-mass_or_gamma.add_argument("-g", "--gamma", type=float, help="fraction between projectile mass and target mass")
-requiredNamed.add_argument("-wfp", "--projectile-water-fraction", type=float, required=True,
-                           help="water fraction of projectile")
-requiredNamed.add_argument("-wft", "--target-water-fraction", type=float, required=True,
-                           help="water fraction of target")
+                           help="the impact velocity [AU/58d]")
+requiredNamed.add_argument("-mp", "--projectile-mass", type=float, required=True, help="mass of the projectile [M_⊙]")
+requiredNamed.add_argument("-mt", "--target-mass", type=float, help="mass of the projectile [M_⊙]")
+
+# Massen in Sonnenmassen
+# gaussche Gravitationskonstante
+# geschwindigkeiten in au/58d
+# radius aus der Masse
+# Winkel in Grad
+# beide Massen statt gamma
+
 args = parser.parse_args()
-print(args)
+# print(args)
+
+solar_mass = 1.98847542e+30  # kg
+ice_density = 0.9167 / 1000 * 100 ** 3  # TODO: check real numbers
+basalt_density = 3 / 1000 * 100 ** 3
+water_fraction = 0.15
+
+alpha = args.alpha
+
+target_water_fraction = water_fraction
+projectile_water_fraction = water_fraction
+
+projectile_mass_sm = args.projectile_mass
+target_mass_sm = args.target_mass
+projectile_mass = projectile_mass_sm / solar_mass
+target_mass = target_mass_sm / solar_mass
+
+
+def core_radius(total_mass, water_fraction, density):
+    core_mass = total_mass * (1 - water_fraction)
+    return (core_mass / density * 3 / 4 / pi) ** (1 / 3)
+
+
+def total_radius(total_mass, water_fraction, density, inner_radius):
+    mantle_mass = total_mass * water_fraction
+    return (mantle_mass / density * 3 / 4 / pi + inner_radius ** 3) ** (1 / 3)
+
+
+target_core_radius = core_radius(target_mass, target_water_fraction, basalt_density)
+target_radius = total_radius(target_mass, target_water_fraction, ice_density, target_core_radius)
+
+projectile_core_radius = core_radius(projectile_mass, projectile_water_fraction, basalt_density)
+projectile_radius = total_radius(projectile_mass, projectile_water_fraction, ice_density, projectile_core_radius)
+
+escape_velocity = sqrt(2 * G * (target_mass + projectile_mass) / (target_radius + projectile_radius))
+
+velocity_original = args.velocity
+
+const = 365.256 / (2 * pi)  # ~58.13
+
+velocity_si = velocity_original * astronomical_unit / const / (60 * 60 * 24)
+velocity = velocity_si / escape_velocity
+gamma = args.projectile_mass_sm / args.target_mass_sm
 
 simulations = SimulationList.jsonlines_load()
 
@@ -30,13 +77,8 @@ scaled_data = scaler.transform_data(simulations.X)
 water_interpolator = RbfInterpolator(scaled_data, simulations.Y_water)
 mass_interpolator = RbfInterpolator(scaled_data, simulations.Y_mass)
 
-if args.gamma:
-    gamma = args.gamma
-else:
-    gamma = args.projectile_mass / args.target_mass
-
-testinput = [args.alpha, args.velocity, args.projectile_mass, gamma,
-             args.target_water_fraction, args.projectile_water_fraction]
+testinput = [alpha, velocity, projectile_mass, gamma,
+             target_water_fraction, projectile_water_fraction]
 scaled_input = list(scaler.transform_parameters(testinput))
 water_retention = water_interpolator.interpolate(*scaled_input)
 mass_retention = mass_interpolator.interpolate(*scaled_input)