Design your own products with Ponoko

A Perpetual Calendar that covers 112 years from 1954 to 2065. Rotate top circle to match month with year, and it calculates the month's calendar for days of the week. Includes a mnemonic for month lengths and a reminder that time is very fleeting. Center hole is 1/4in. (6.35mm) and overall dimensions are 3.9in. (~100mm) in diameter I will have a bamboo option once I receive it from Ponoko.

Mnemonic: Thirty days hath September,
April, June, and November,
All the rest have 31
Excepting February alone,
Which hath but 28, in fine,
Until leap year gives it 29.

Poem:
The days... come and go like
muffled and veiled figures,
sent from a distant
friendly party;
buy they say nothing,
and if we do not use
the gifts they bring
they carry them
as silently away.

Message me with any questions.