[tikz]地球绕着太阳转、月亮绕着地球转

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zhuanlan.zhihu.com/p/54877220
2019-01-05，PGF/TikZ 发布了 v3.1（ctan.org/ctan-ann/id/mailman.640.1546781639.5 … 14.ctan-ann@ctan.org）增加了生成动画的库（animations）。

1. \documentclass[tikz, margin=3pt, dvisvgm]{standalone}
2. \usetikzlibrary{animations}
3. \begin{document}
4. \begin{tikzpicture}[
5.     animate/orbit/.style 2 args = {
6.     myself:shift = {
7.     along = {
8.     (0,0) circle [radius=#1]
9.     } sloped in #2s/10,
10.     repeats }} ]
11.   \node :color = {0s = "orange",
12.                   2s = "red",
13.                   4s = "orange",
14.                   repeats}
15.                   {Sun};
16.   \begin{scope}[animate={orbit={2.5cm}{365}}]
17.   \node {Earth};
18.   \node [animate={orbit={1cm}{28}}] {Moon};
19.   \end{scope}
20.   \useasboundingbox (-3.8,-3.8) (3.8,3.8);
21. \end{tikzpicture}
22. \end{document}

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