A Perpetual Calendar in a Nutshell
Rigge, William F., S.J.
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First Paragraph: Those of our readers who are interested in calendars will find the annexed little table very serviceable. This table gives within a small space the Dominical letter for every day of the year. As these letters are always the same, all we need in addition is the table opposite the title page of this calendar, in order to know upon what day of the week any date of this century will fall. Let us explain this.