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The ornamental design for a perpetual calendar, as shown and described. |
FIG. 1 is a perspective view of the perpetual calendar, according to my new design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a bottom plan view of the perpetual calendar;
FIG. 6 is a side elevation looking in from the left of FIG. 1; and,
FIG. 7 is a side elevation looking in from the right of FIG. 1.
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