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diff --git a/notes/classic_gravitation.toml b/notes/classic_gravitation.toml
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+
+[model]
+name-en = "Classic Gravitation"
+descrption-en = "Newtonian"
+sexprs = ['''
+  (=
+    F
+    (/ (* G m1 m2)
+       (square r 2)))
+  ''']
+
+[variables]
+
+  [variables.G]
+  type = "constant"
+  name-en = "Gravitational Constant"
+  value_si = 6.674e-11
+
+  [variables.F]
+  type = 'dependent'
+  name-en = "force"
+  units_si = "unit"
+
+  [variables.r]
+  type = 'independent'
+  name-en = "distance"
+  units_si = "meter"
+
+  [variables.m1]
+  type = 'independent'
+  latex = 'm_1'
+  name = "mass #1"
+  units_si = "kilogram"
+
+  [variables.m2]
+  type = 'independent'
+  latex = 'm_2'
+  name = "mass #2"
+  units_si = "kilogram"
+
+[examples]
+
+  [examples.earth_surface]
+  r = 6.371e6       # radius of earth
+  m1 = 5.972e24     # mass of earth
+  m2 = 70           # mass of human
+
+  [examples.earth_moon]
+  r = 385000        # radius of earth
+  m1 = 5.972e24     # mass of earth
+  m2 = 7.348e22     # mass of moon
+
+
+[references]
+  
+  [references.url]
+  "Mathworld" = "http://mathworld.wolfram.com/Lotka-VolterraEquations.html"
+  "Wikipedia" = "https://en.wikipedia.org/wiki/Lotka%E2%80%93Volterra_equations"
+