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| | Perpetual Calendar |
 | | In addition, the front sheet of the calendar should contain a conversion-table (9), stating how many years have to be added or subtracted in order to use the calendar for years not listed in the year-section (2) of the disk. |
 | | When this is done, the months appearing through the month-slot, and the week-days and date-numbers on the front sheet, constitute a complete and condensed calendar for the year in question, the week-day for any date appearing in the same row as the month, and the same column as the date. |
 | | In the present application, no such special treatment of leap-years is required or used, the calendar being operated for leap-years in exactly the same manner as for other years, the operation thus being simplified so that no such caution is required of the user of the calendar. |
| www.sidis.net /Calendar.htm (781 words) |
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