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Dozenal Society of America
Promoting base twelve and alternative base mathematics
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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.


The DSA is a non-profit, voluntary organization; we depend on the generosity and members and well-wishers to continue our educational mission.

Remember that the DSA pays no salaries, so every penny you donate goes to furthering that mission.

Please note that the DSA is a tax-exempt organization under section 501(c)(3) of the Internal Revenue Code; as such, contributions to the Society may be tax-deductible under applicable laws.


Of course, if you would prefer to make your donation by check, then you are still welcome to do so. Please send checks, payable to the Dozenal Society of America, to:

       Prof. Jay Schiffman
       604-36 South Washington Square, #815
       Philadelphia, PA 19106-4115

Thank you for your support! The DSA cannot do its work without you.