Théorie des calendriers perpétuels portatifs
How do these small, portable calendars work, showing the day of the week for any date 40, 50, 100, or even 1200 years in the future? How is the mechanism so simple? Let's discover the theory behind these intriguing objects! Links used: Mentally find a day of the week between 1901 and 2099: • Astuce pour retrouver le jour de la semain... Definition of leap years: https://fr.wikipedia.org/wiki/Ann%C3%... Sunday letter: https://fr.wikipedia.org/wiki/Lettre_... Images of portable calendars: https://www.google.com/search?q=years... Business card holder: https://www.nautic-gifts.nl/fr/cadeau... 1200-year calendar: https://www.chasse-maree.com/boutique... Orient Watch: https://www.creationwatches.com/produ...
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