| 摘要 |
A perpetual calendar has a top sheet member having several viewing apertures formed therein. The top sheet displays on a top surface thereof in seven vertical columns the dates of the month from one to twenty-eight. One of the apertures is positioned to display up to three additional dates of the month after the numeral 28. An intermediate substrate layer is disposed beneath the top sheet and is rotatably mounted thereto. This substrate displays on a top surface thereof data for indicating days of the week, which is displayable through one of the apertures. A bottom substrate or sheet is disposed beneath the intermediate substrate and is rotatably mounted with respect to the other two substrates or sheets. This substrate layer displays on a top surface thereof the 12 months of the year and also month ending date or dates for months having more than 28 days. This substrate is rotatable to display the current month through one aperture and correct month ending date or dates for that month through another aperture. Preferably the device is also capable of displaying through apertures of the top sheet data relating to zodiac signs for the indicated month.
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