diff --git a/physics/terra-luna/sistema_inerziale.tex b/physics/terra-luna/sistema_inerziale.tex
index 64975f9..335f1d5 100755
--- a/physics/terra-luna/sistema_inerziale.tex
+++ b/physics/terra-luna/sistema_inerziale.tex
@@ -1,11 +1,7 @@
 \documentclass{standalone}
 %
 \usepackage{tikz}
-\usetikzlibrary{
-	%backgrounds,
-	%decorations.pathmorphing,
-	arrows.meta
-}
+\usetikzlibrary{arrows.meta}
 %
 \usepackage{tkz-euclide}
 \usetkzobj{all}
@@ -16,13 +12,10 @@
 %
 \definecolor{space}{HTML}{0A2543}
 \definecolor{earth}{HTML}{0089FA}
-\definecolor{earthn}{HTML}{0C5898}
 \definecolor{land}{HTML}{309347}
 \definecolor{moon}{HTML}{AFAFAF}
 \definecolor{craterm}{HTML}{616060}
 \definecolor{linem}{HTML}{DBDBDB}
-\definecolor{dida}{HTML}{FFDE00}
-\definecolor{title}{HTML}{FBA706}
 %
 \usepackage{amsmath}
 %