perpetual calendar   (TTS Sound)

The perpetual_calendar has 1 Senses.

• perpetual calendar
• 万年暦
• a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years
• 何年もの長期にわたり、あらゆる日付に対応する週の曜日を示す図か機械的な装置