Ring Clock

Ring Clock

Ring Clock returns to the watch’s roots as jewelry, but puts it on the finger instead of the wrist. I’ll admit that I’m a little concerned about the exposed rings getting jarred or blocked, but it’s definitely stylish. It even gets 24-hours right.

Disk Calendar now in Chrome Web Store

Moon Disk is now available in the Chrome Web Store.

Disk Clock takes the idea of clock and turns it inside-out by moving the faces instead of the hand. Disk Calendar extends the time period to week, moon, and year.

This is a calendar of sorts, built on natural cycles. Since the regular pace of a ‘clock’ doesn’t align well with irregular months and leap years, the pace is even. Thus, the year follows the solar year, and a moon stands in for a month. Weeks are thankfully regular, and work just as you’d expect.

Moon Disk Now in the Chrome Web Store

Moon Disk is now available in the Chrome Web Store. Like Day Disk, the moon disk provides a simple, single-purpose view of a natural cycle.

One small note – the actual lunar cycle can vary by as much as fourteen hours, while the Moon Disk keeps a constant pace.

The Hanke-Henry Calendar

The Hanke-Henry calendar attempts to align the year so that a particular date is always on the same day of the week. It does this by slightly reducing the length of the year. Rather than a leap year adding a day every four years, it adds an entire week every five or six years in order to maintain the day alignment. Along the way, it aligns the 30/31 schedule with the quarters and makes february unexceptional.

Disk Clock currently uses a solar year – the leap weeks would still require figuring out how to change the size of disks, just like the leap days we have now.

The Present

The Present

The Present is a Kickstarter project to create a physical clock that represents and entire year with graduations between four colors. I rather the color choices – if only the face rotated. Scott Thrift is a fellow time revolutionary (and a much more successful one)



Aelios is an iPad app that provides a nicely rendered 24-hour clock. Sadly it still uses fixed face and moving hand. it has an especially nice interface for setting location, and offers world weather forecasts around the dial. Such data augmentation has always been interesting possibility for disk clock, not yet realized. Would you find it interesting?

Death Clock

Screenshot: Lifetime Disk (1.2)

Death Clock provides a countdown of seconds until your death, based on a few health-related questions

If you’re up to editing the html file, Disk Clock can show the time until you turn 80, but the time of death isn’t yet customizable.

Long Count

Screenshot: Long Count (0.12)

Disk Clock has disk sets for both the apocalyptic 13-baktun, and the 20-backtun.

The Long Count is another mesoamerican calendar. It was used for recording large scale events that extended beyond the 52-year cycle. It was based on ‘digits’ of 20, with one 18 to make the lower two digits approximate a year. There are at least two versions – one popular rendition has a digit of 13 instead of 20, which will cause the whole cycle to roll over at December 20, 2012. (The other view assumes that the digit counts to 20, like all the rest.)


Screenshot: Tzolk'in (0.12)

Disk Clock shows the Tzolk’in, and I think it’s a rather nice way to view the interlocking cycles.

The mesoamerican cultures had a fascinating calendar system based on interlocking cycles of 13 and 20. (Tzolk’in to the Maya, Tonalpohualli to the Aztec, and probably other names to other cultures.) Unfortunately, this only accounts for 260 days, so it was usually combined with a solar year counting system based on similar principles, but using a more traditional month/day arrangement. (The Haab) The combination of dates between the two systems repeated every 52 years, which became a time of major celebration.

Living Calendar

Living Calendar

Living Calendar is constructed like a standard dial-and-hands clock, with two scales for days of the year and week. The year dial includes the things you’d expect from a calendar – holidays and other events.