Sundial Calculator

Vertical declining sundial — polar-aligned gnomon with substyle rotation

From the shop

You picked DIY Bundle. Enter your wall details below, then click Buy to complete checkout.

Location
Selected: Vienna
Wall Orientation
NSEWEW
N 0°E 90°S 180°W 270°N 360°

The direction the wall faces outward. South = 180°, North = 0°.

Wall normal: 180.0° (due south)
Dial Face
Gnomon Type
Key principle:
The gnomon must point to the celestial pole. On a declining wall its base rotates 0.0° from vertical.
789101112 NOON131415161718
━ Noon line╌ Substyle (gnomon base)
Style height: 41.79° · Substyle: 0.00° from vertical · Long. corr: +5.5 min
Choose a variant
PDF Kit€24
1:1 cut-stencil template + A4 installation instructions, both PDF.
Digital — no shipping
SVG Kit€36
Vector cut file for vinyl plotters and laser cutters, plus the 1:1 template + A4 instructions PDFs.
Digital — no shipping
DIY Kit€36
Hour-line angles table for hand-drawing on the wall, plus the 1:1 template + A4 instructions PDFs.
Digital — no shipping
PDF Bundle€72
PDF Kit + alignment jig, shipped together.
Ships in 5–7 days
SVG Bundle€84
SVG Kit + alignment jig, shipped together.
Ships in 5–7 days
DIY Bundle€84
DIY Kit + alignment jig, shipped together.
Ships in 5–7 days
Add alignment jig (without PDF kit)€48 + shipping
3D-printed jig sized to your dial. Most buyers want the bundle.
Your dial configuration travels with the order — Stripe stores the inputs as metadata; we generate your custom files from them after payment.
Algorithm
φ=48.2082° · d=0.00° · TZ=UTC+1
sin(SH) = cos(d)·cos(φ) → SH = 41.79°
tan(SD) = sin(d)/tan(φ) → SD = 0.00°
tan(Hsub) = sin(SH)·tan(t − DL) [substyle-relative method]
Long. correction = 5.5 min