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Well done, it’s a fascinating topic - so much so I’ve somehow ended up buying three different revisions of the book 
Just noting that D&R assert all rights over their code, formulas and calendar data and grant a license for personal use only.
I would propose you note this in both your packages in case someone accidentally believes the libraries can be used in commercial software without a specific license grant from D&R.
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Thank you for your kind feedback and your suggestion!
I integrated the text that was used for the calcalc package (GitHub - ferd/calcalc: Calendrical Calculations; Erlang port of Dershowitz & Reingold's algorithms. · GitHub) into the README.md files of my pakages.
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