New on CTAN: ptolemaicastronomy

[CTAN Announcements]

Richard Zach submitted the

                ptolemaicastronomy

package.

Version number: 1.0
License type: lppl1.3c

Summary description: Diagrams of sphere models for variably strict
conditionals (Lewis counterfactuals)

Announcement text:
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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. 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.


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This package is located at 
   http://mirror.ctan.org/graphics/pgf/contrib/ptolemaicastronomy

More information is at
   https://www.ctan.org/pkg/ptolemaicastronomy


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   Thanks for the upload.

     For the CTAN Team
    Manfred Lotz



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