| 摘要 |
A perpetual calendar wheel chart for determining the calendar for a particular year past, present, or future is comprised of two wheel members adapted to rotate about a common center. The first wheel member has in its center indicia representing the tens and ones digits of the year and has around its circumference indicia representing the day of the month. The second wheel member atop the first wheel member is generally transparent and has in its center indicia representing the hundreds and thousands digits of the year for aligning with the ones and tens digits of the year indicia of the first member and has around its circumference twelve transparent windows representing the months of the year that align with the day of the month indicia of the first member to indicate the calendar for a particular year.
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