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Universal Ring Dial

Universal Ring Dial 3d printed Mechanical parts Jewelry Render with the dial on August 15, around 9 o'clock
Render with the dial on August 15, around 9 o'clock
  • White Detail

    Firm white plastic with a smooth surface and rubbery feel.


Warning: this is an old but functional version. Check the newer version at:

This Universal Equinoctial Ring Dial is a portable and self-orientating sundial. You can see how a similar dial works: .

You''ll get in position the meridian ring, the equatorial ring and the central bar. The eyelet must be inserted through the "jasolo fecit" part of the meridian ring. The slider is entered through the slit of the central bar and then it is turned with a little force.

For finishing, dip the model a couple of hours in cold tea (hot or warm tea will deform the model). Later, paint with black ink the marks and once dried, remove the ink with a wet tissue (ink will remain on the marks).


IN: 2.254 w x 2.254 d x 2.254 h
CM: 5.724 w x 2.396 d x 7.112 h


I've uploaded a new version of this model at: The parts move less loose and it's fully modular so replacement parts can be purchased separately.
December 4, 2010, 11:14 am
This clock shows apparent solar time (or true or real solar time), that is, 12h is when the Sun passes over your local meridian (true South). So the hours do not always last 60 minutes. I'm not sure if the time difference due to the obliquity of the ecliptic is accounted. The central bar (with the months and days marks) considers that obliquity in order to get the light spot falling on the middle of the equatorial ring (that one with the hours marks). And yes, this device points to true North when showing the hour; then the meridian ring is your local meridian, and the axis of the central bar (months&days marks) is parallel to the Earth axis.
October 29, 2010, 5:04 pm
That is an ingenious device! I am considering ordering one, but I have two technical questions: 1. Does the slider account entirely for the error due to the "equation of time" (which is inherent in all sundials)? It looks like it only accounts for one of the two factors causing that error, as can be seen here: 2. Can this device be used to indicate which direction is true north? Thank you!
October 29, 2010, 4:11 pm
The legibility has been improved (sorry, I forgot to change the description). And although I have changed the equatorial ring to be printed in the same plane as the other parts, this change has not been applied to this model. Finally I'm still redesigning the slider, that gets a little tilted when changing the date.
September 14, 2010, 9:00 am
Let us know when the improvements for legibility are done; I'm looking forward to getting one of these.
September 13, 2010, 12:05 pm
My idea was to order it the next week, so we will see printed at the end of July or beginning of August.
July 6, 2010, 12:36 pm
great model. Will we see it printed?
July 6, 2010, 11:30 am