ptolemaicastronomy (6apr19)

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+ptolemaicastronomy
+==================
+
+Diagrams of sphere models for variably strict conditionals (Lewis
+counterfactuals)
+
+Author: Richard Zach
+E-mail: rzach@ucalgary.ca
+License: Released under the LaTeX Project Public License v1.3c or later
+See: http://www.latex-project.org/lppl.txt
+
+David K. Lewis (Counterfactuals, Blackwell 1973) introduced a sphere
+semantics for counterfactual conditionals. He jokingly referred to the
+diagrams depicting such sphere models as Ptolemaic astronomy, hence
+the name of this package. It has nothing to do with Ptolemy or with
+astronomy, sorry.
+
+The macros provided in this package aid in the construction of
+sphere model diagrams in the style of Lewis. The macros all make use
+of TikZ.
+
+See https://github.com/rzach/ptolemaic-astronomy
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