File:Precession and seasons.svg

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Original file ‎(SVG file, nominally 787 × 639 pixels, file size: 54 KB)

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Description
English: Effects of precession on the seasons (using the Northern Hemisphere terms).
Date
Source Own work
Author Krishnavedala
SVG development
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This vector image was created with LaTeX and converted to SVG using dvisvgm
Source code
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Source Code 
\documentclass[12pt,border=1pt,crop,multi=false,tikz,class=scrartcl]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{mathtools}
\usepackage{setspace}
 
\usetikzlibrary{arrows,shapes,calc,positioning,fit,decorations.markings}

\begin{document}
\sffamily
\footnotesize
\setstretch{1}
  \begin{tikzpicture}[>=latex',semithick,auto,remember picture]
  \node at (-7,0) (o1) {\begin{tikzpicture}[scale=1,>=latex',
  decoration={markings, mark=at position 0.85 with {\arrow[scale=3]{>} } }]
  	\draw [fill=cyan!30,opacity=.6,postaction={decorate}] (0,0) ellipse (2.5981 and 3);
	\draw (0,-3) -- (0,3) (-2.25,-1.5) -- (2.25,-1.5);
	\draw [fill=yellow] (0,-1.5) circle (.3);
	\draw [->,red,ultra thick] (-.5,-3) -- (.5,-3);
	\draw [->,red,ultra thick] (-.5,3) -- (.5,3);
	\draw [->,red,ultra thick] (-2.75,-1.5) -- (-1.75,-1.5);
	\draw [->,red,ultra thick] (1.75,-1.5) -- (2.75,-1.5);
	\draw [fill=blue] 
		(0,-3) circle (.2)
		(0,3) circle (.2)
		(-2.25,-1.5) circle (.2)
		(2.25,-1.5) circle (.2);
	\node [text centered] at (-1.2,.8) {Spring};
	\node [text centered] at (1.2,.8) {Winter};
	\node [text centered] at (-1,-2) {Summer};
	\node [text centered] at (1,-2) {Fall};
	\node [text centered, text width=5em] at (0,3.8) {Spring Equinox};
	\node [text centered, text width=5em] at (0,-3.8) {Fall Equinox};
	\node [text centered, text width=5em] at (-3.5,-1.5) {Summer Solstice};
	\node [text centered, text width=5em] at (3.5,-1.5) {Winter Solstice};
	\end{tikzpicture}
	};
    \node [text centered,text width=16em] at (-7,-4.7) (t1) {\normalsize 5000 years ago and 15000 years from now};
    \node at (7,0) (o2) {\begin{tikzpicture}[scale=1,>=latex',
  decoration={markings, mark=at position 0.85 with {\arrow[scale=3]{>} } }]
  	\draw [fill=cyan!30,opacity=.6,postaction={decorate}] (0,0) ellipse (2.5981 and 3);
	\draw (0,-3) -- (0,3) (-2.25,-1.5) -- (2.25,-1.5);
	\draw [fill=yellow] (0,-1.5) circle (.3);
	\draw [<-,red,ultra thick] (-.5,-3) -- (.5,-3);
	\draw [<-,red,ultra thick] (-.5,3) -- (.5,3);
	\draw [<-,red,ultra thick] (-2.75,-1.5) -- (-1.75,-1.5);
	\draw [<-,red,ultra thick] (1.75,-1.5) -- (2.75,-1.5);
	\draw [fill=blue] 
		(0,-3) circle (.2)
		(0,3) circle (.2)
		(-2.25,-1.5) circle (.2)
		(2.25,-1.5) circle (.2);
	\node [text centered] at (-1.2,.8) {Fall};
	\node [text centered] at (1.2,.8) {Summer};
	\node [text centered] at (-1,-2) {Winter};
	\node [text centered] at (1,-2) {Spring};
	\node [text centered, text width=5em] at (0,3.8) {Fall Equinox};
	\node [text centered, text width=5em] at (0,-3.8) {Spring Equinox};
	\node [text centered, text width=5em] at (-3.5,-1.5) {Winter Solstice};
	\node [text centered, text width=5em] at (3.5,-1.5) {Summer Solstice};
	\end{tikzpicture}
	};
  \node [text centered,text width=16em] at (7,-4.7) (t2) {\normalsize 5000 years from now};
  \node at (0,-4.5) (o3) {\begin{tikzpicture}[scale=1,>=latex',
  decoration={markings, mark=at position 0.85 with {\arrow[scale=3]{>} } }]
  	\draw [fill=cyan!30,opacity=.6,postaction={decorate}] (0,0) ellipse (2.5981 and 3);
	\draw (0,-3) -- (0,3) (-2.25,-1.5) -- (2.25,-1.5);
	\draw [fill=yellow] (0,-1.5) circle (.3);
	\draw [->,red,ultra thick] (0,-3.5) -- (0,-2.5);
	\draw [->,red,ultra thick] (0,2.5) -- (0,3.5);
	\draw [->,red,ultra thick] (-2.25,-2) -- (-2.25,-1);
	\draw [->,red,ultra thick] (2.25,-2) -- (2.25,-1);
	\draw [fill=blue] 
		(0,-3) circle (.2)
		(0,3) circle (.2)
		(-2.25,-1.5) circle (.2)
		(2.25,-1.5) circle (.2);
	\node [text centered] at (-1.2,.8) {Winter};
	\node [text centered] at (1.2,.8) {Fall};
	\node [text centered] at (-1,-2) {Spring};
	\node [text centered] at (1,-2) {Summer};
	\node [text centered, text width=5em] at (0,3.8) {Winter Solstice};
	\node [text centered, text width=5em] at (0,-3.8) {Summer Solstice};
	\node [text centered, text width=5em] at (-3.5,-1.5) {Spring Equinox};
	\node [text centered, text width=5em] at (3.5,-1.5) {Fall Equinox};
	\end{tikzpicture}
	};
  \node [text centered,text width=16em] at (0,-9.2) (t3) {\normalsize Earth's orbit 10000 years from now};
  \node at (0,4.5) (o4) {\begin{tikzpicture}[scale=1,>=latex',rotate=-18,
  decoration={markings, mark=at position 0.85 with {\arrow[scale=3]{>} } }]
  	\draw [fill=cyan!30,opacity=.6,postaction={decorate}] (0,0) ellipse (2.5981 and 3);
	\draw (0,-3) -- (0,3) (-2.25,-1.5) -- (2.25,-1.5);
	\draw [fill=yellow] (0,-1.5) circle (.3);
	\draw [<-,red,ultra thick] (0,-3.5) -- (0,-2.5);
	\draw [<-,red,ultra thick] (0,2.5) -- (0,3.5);
	\draw [<-,red,ultra thick] (-2.25,-2) -- (-2.25,-1);
	\draw [<-,red,ultra thick] (2.25,-2) -- (2.25,-1);
	\draw [fill=blue] 
		(0,-3) circle (.2)
		(0,3) circle (.2)
		(-2.25,-1.5) circle (.2)
		(2.25,-1.5) circle (.2);
	\node [text centered] at (-1.2,.8) {Summer};
	\node [text centered] at (1.2,.8) {Spring};
	\node [text centered] at (-1,-2) {Fall};
	\node [text centered] at (1,-2) {Winter};
	\node [text centered, text width=5em] at (0,3.8) {Summer Solstice};
	\node [text centered, text width=5em] at (0,-3.8) {Winter Solstice};
	\node [text centered, text width=5em] at (-3.5,-1.5) {Fall Equinox};
	\node [text centered, text width=5em] at (3.5,-1.5) {Spring Equinox};
	\end{tikzpicture}
	};
  \node [text centered,text width=8em] at (-2.5,7) (t4) {\normalsize Earth's \\orbit today};
  \draw [->,ultra thick] (o1.north) .. controls ++(0,1.5) and ++(-1.5,0) .. (t4.west);
  \draw [->,ultra thick,red] (-7.9,7.5) -- (-8.9,7.5);
  \node [text centered,text width=11em] at (-8.4,6) {\normalsize Direction North Pole points\\(actually inclined only 23.5$^\circ$)};
  \draw [->,ultra thick] (o4.30) ++(-1,0) .. controls ++(1.5,0) and ++(0,1.5) .. (o2.north)
  	node [pos=.5,above right,text centered,text width=8em] {\normalsize Precession direction};
  \draw [->,ultra thick] (t2.south) .. controls ++(0,-1.5) and ++(1.5,0) .. (t3.north east)
  	node [pos=.5,right=2em,text centered,text width=8em] {\normalsize Indicated seasons are for northern hemisphere};
  \draw [->,ultra thick] (t3.west) ++(.8,0) .. controls ++(-1.5,0) and ++(0,-1.5) .. (t1.south);
  \end{tikzpicture}
\end{document}

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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Date/TimeThumbnailDimensionsUserComment
current15:34, 19 April 2015Thumbnail for version as of 15:34, 19 April 2015787 × 639 (54 KB)Krishnavedala (talk | contribs)from the corrected source-code
15:29, 8 January 2015Thumbnail for version as of 15:29, 8 January 2015787 × 645 (69 KB)Krishnavedala (talk | contribs){{Information |Description ={{en|1=Effects of precession on the seasons (using the Northern Hemisphere terms).}} |Source ={{own}} |Author =Krishnavedala |Date =2015-01-08 |Permission = |other_vers...

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