Heliochronometer Sundial - 2026 - Accurate to within 1 minute!

Change History

Update (4-06-26):  (Optional) Added a blank analemma plate for those who want to experiment with their own analemma curves & text.  Check the file folder: Blank Analemma Plate.

Update (12-07-26): The file Clock_Hybrid_Gard_Latitude_Crescent_Bushings.stl was missing.  These 3 bushings ride along the latitude crescent & fit inside the pedestal halves. 

Summary

This is a remix of the 2025 version with the following added improvements:

• Smoother riding Standard Time meridian offset adjustments, i.e., longitude, with the addition of bushings;

• Standard Time meridian offsets can now be "tuned in" by turning a geared knob;

• Full latitude adjustments from 0 to 90 degrees.  The original 2025 version was restrictive for settings near the equator;

• Larger degree markings on the latitude crescent for improved readability;

• Smoother riding latitude crescent adjustments with the addition of bushings, which fit inside the pedestal halves;

• Thinner analemma curve for improved nodus/oculus aiming accuracy;

• An optional 4-piece analemma design is available to facilitate printing without having to use messy Markup paint sticks;

• Smaller oculus diameter at the nodus, also for improved aiming accuracy;

• 2-piece pedestal to facilitate printing;

• New base to accommodate pedestal design change.

Most importantly, still accurate to within 1 minute.

The printer-friendly analemma curve, which doesn't require any messy post-processing/painting to highlight the curve, is available here:  https://www.printables.com/model/1460171-print-friendly-curved-analemma-vertical-plate-for

However, I find that using ABS yields the cleanest & sharpest analemma line with the original engraved plate design. Some cleaning may be required with a sharp knife to yield a smoother curve & a consistent groove depth. 

Assembly instructions are to follow.  In the meantime, check out the included assembly photos.

Also check the original 2025 version for additional design & assembly details:  Super Accurate Heliochronometer Sundial - 2025 by 3DMason | Download free STL model | Printables.com