150mm Equinoctial Sundial

Easy print, just 3 pieces. Bicycle spoke bits for axles. Put in the inner ring before glueing on the glue-piece.

These people sell a real nice brass version. This also is where I got the ideas to make this one. Thank you.

https://www.pocket-sundial.com/products/kala-sundial

Here is a video of this type of sundial.

I don't use month of year adjustments, just angle it so the light line is as thin as possible and centered in the shadow.

Count up the holes to equal your latitude and put a string through it.

Place the sundial so that the slot corresponds to your latitude.
If you are at the 45th latitude set the coin/sundial slot to be at 45 degrees from horizontal.
Put the sundial base (or make a base out of pine-tar or gum) on a level surface.
So the sundial face is vertical with the slot at the correct angle.

Count where you see the light from the edge of the dial in 1/12ths, each 1/12th equaling a hour.
Starts at 6 am and the other side of the dial is 6 pm, the middle is noon.

Important note: I did no know about apertures and focal lengths well enough.

So, maybe, make the slot in the center about 2mm wide with a saw blade (gently).

Very important, maybe I fix file later.