From 2e2ba54c60a2c0709b9405fef8de1b78e3c9f61d Mon Sep 17 00:00:00 2001
From: ulaulaman <34242086+ulaulaman@users.noreply.github.com>
Date: Tue, 25 Jun 2019 11:22:53 +0200
Subject: [PATCH] Percorso del Sole nel cielo

Il percorso diurno del Sole durante solstizi ed equinozi visto da un osservatore posto all'equatore
---
 crepuscolo_equatore.tex | 80 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 crepuscolo_equatore.tex

diff --git a/crepuscolo_equatore.tex b/crepuscolo_equatore.tex
new file mode 100644
index 0000000..7fb7fae
--- /dev/null
+++ b/crepuscolo_equatore.tex
@@ -0,0 +1,80 @@
+\documentclass{standalone}
+%
+\usepackage{tikz}
+\usepackage{xcolor}
+\definecolor{space}{HTML}{0A2543}
+\definecolor{earth}{HTML}{0089FA}
+%
+\usepackage{mathptmx}
+\usepackage{fontspec}
+\setmainfont{Montserrat}
+%
+\title{Percorso diurno del sole dall'equatore}
+\begin{document}
+	\tikzset{partial ellipse/.style args = {#1:#2:#3}{insert path={+ (#1:#3) arc (#1:#2:#3)}}}
+	\begin{tikzpicture}
+		%
+		\begin{scope}[xshift={(-0.2cm)},yshift={(0.2cm)}]
+			\draw (0,0) [color=space, ultra thick, dashed, partial ellipse=162:342:2.6 and 7.8];%equinozio linea tratteggiata
+			\draw (2.8,0) [color=space, ultra thick, dashed, partial ellipse=159:344:2.4 and 7.2];%solstizio estate linea tratteggiata
+			\draw (-2.9,0) [color=space, ultra thick, dashed, partial ellipse=164:339:2.3 and 7.15];%solstizio inverno linea tratteggiata
+			\draw [fill=earth, opacity=0.5] (0,0) ellipse (7.8cm and 2.6cm);%piano nord-sud
+			\draw [->,ultra thick, color=black] (-9,0) -- (9,0);%asse nord-sud
+			\node at (-10.7,0.5) () {\textcolor{black}{\fontsize{20}{21}\selectfont Polo sud}};
+			\node at (-10.5,-0.3) () {\textcolor{black}{\fontsize{20}{21}\selectfont celeste}};
+			\node at (10.9,0.5) () {\textcolor{black}{\fontsize{20}{21}\selectfont Polo nord}};
+			\node at (10.4,-0.3) () {\textcolor{black}{\fontsize{20}{21}\selectfont celeste}};
+			%
+			\draw (0,0) [color=space, ultra thick, latex-, partial ellipse=36:-18:2.6 and 7.8];%equinozio linea continua
+			\draw (0,0) [color=space, ultra thick, partial ellipse=162:35:2.6 and 7.8];%equinozio linea continua
+			\draw (2.8,0) [color=space, ultra thick, latex-, partial ellipse=36:-16:2.4 and 7.2];%solstizio estate linea continua
+			\draw (2.8,0) [color=space, ultra thick, partial ellipse=159:35:2.4 and 7.2];%solstizio estate linea continua
+			\draw (-2.9,0) [color=space, ultra thick, latex-, partial ellipse=36:-21:2.3 and 7.15];%solstizio inverno linea continua
+			\draw (-2.9,0) [color=space, ultra thick, partial ellipse=146:35:2.3 and 7.15];%solstizio inverno linea continua
+			\draw (-2.9,0) [color=red, ultra thick, latex-, partial ellipse=164:145:2.3 and 7.15];%linea rossa Mario
+			\draw [color=space, ultra thick] (0,0) circle (7.8cm);%meridiana osservatore
+			\draw [fill=earth] (0,0) circle (0.1cm);%osservatore
+			%
+			\draw [->, thick, color=black] (-0.5,-0.5) -- (-0.1,-0.1);
+			\node at (-2.8,-0.5) () {\textcolor{black}{\fontsize{20}{21}\selectfont Osservatore}};
+			%
+			\draw [->, thick, color=black] (-4,-2.8) -- (-3.6,-2.4);
+			\node at (-5.8,-2.8) () {\textcolor{black}{\fontsize{20}{21}\selectfont Orizzonte}};
+			%
+			\draw [-, ultra thick, color=black] (0,7.6) -- (0,8);
+			\node at (0,8.5) () {\textcolor{black}{\fontsize{20}{21}\selectfont Zenit}};
+			\draw [-, ultra thick, color=black] (0,-7.6) -- (0,-8);
+			\node at (0,-8.3) () {\textcolor{black}{\fontsize{20}{21}\selectfont Nadir}};
+			%
+			\draw [-, ultra thick, color=black] (3.1,7.2) -- (3.1,7.6);
+			\node at (3.4,8) () {\textcolor{black}{\fontsize{20}{21}\selectfont $23.5^\circ$ N}};
+			\draw [-, ultra thick, color=black] (-3.1,7.2) -- (-3.1,7.6);
+			\node at (-3.2,8) () {\textcolor{black}{\fontsize{20}{21}\selectfont $23.5^\circ$ S}};
+			%
+			\draw [<-, thick, color=black] (-4.2,-6) -- (-4.6,-6.4);
+			\node at (-6,-6.5) () {\textcolor{black}{\fontsize{20}{21}\selectfont Solstizio}};
+			\node at (-6.2,-7.1) () {\textcolor{black}{\fontsize{20}{21}\selectfont d'inverno}};
+			%
+			\draw [<-, thick, color=black] (4.2,-6) -- (4.6,-6.4);
+			\node at (6.2,-6.3) () {\textcolor{black}{\fontsize{20}{21}\selectfont Solstizio}};
+			\node at (6.2,-6.9) () {\textcolor{black}{\fontsize{20}{21}\selectfont d'estate}};
+			%
+			\draw [<-, thick, color=black] (5.1,3) -- (5.8,3);
+			\node at (8.5,3.1) () {\textcolor{black}{\fontsize{20}{21}\selectfont Cerchio diurno}};
+			%
+			\draw [<-, thick, color=black] (2.7,-1.1) -- (3.4,-1.1);
+			\node at (6.4,-1.1) () {\textcolor{black}{\fontsize{20}{21}\selectfont Equatore celeste}};
+			%
+			\draw [<-, thick, color=black] (2.2,-4.7) -- (2.9,-4.7);
+			\node at (4.7,-4.7) () {\textcolor{black}{\fontsize{20}{21}\selectfont Equinozio}};
+			%
+			\draw [->, thick, color=black] (-6.2,5.9) -- (-5.9,5.5);
+			\node at (-8.2,6.2) () {\textcolor{black}{\fontsize{20}{21}\selectfont Meridiano}};
+			\node at (-9.2,5.6) () {\textcolor{black}{\fontsize{20}{21}\selectfont dell'osservatore}};
+			%
+			\node at (-3,2.9) () {\textcolor{black}{\fontsize{20}{21}\selectfont O}};
+			\node at (2.8,-2.9) () {\textcolor{black}{\fontsize{20}{21}\selectfont E}};
+		\end{scope}
+	\end{tikzpicture}
+%
+\end{document}