Vertical declining sundials
Design a sundial for your wall.
A free, accurate calculator for vertical sundials — any latitude, any wall orientation. Print a 1:1 template, or order a custom 3D-printed alignment jig and mount one that still works three hundred years from now.
Three ways in
Design, learn, or take one home.
Calculator
Design the dial
Set your latitude and wall orientation. Watch the hour lines, substyle, and gnomon update in real time. Free to use, no login.
Open the calculator →Learn
Understand the geometry
Short articles on how vertical sundials work, how the sun moves across a year, and why a dial reads different time than a watch.
Browse articles →Shop
Print or mount one
A PDF kit for printing a 1:1 template at a local print shop, or a 3D-printed alignment jig custom-sized for your wall.
See the shop →
Nortia
The Etruscan goddess of time on a wall.
Each year at Volsinii, a nail was driven into the wall of Nortia’s temple to mark the passing of another year — the mythological ancestor of the gnomon, which marks each passing hour.