For full scale templates, check
Hit Diagrams to PDF
to create a full scale .PDF to print. You can 'Poster Print' a large template image over multiple smaller (A4 or Letter) sized pages
and reassemble to form a single large template (hit 'Diagrams to PDF' for instructions) or take to a Print Shop (up to size A0).
Cut around the template, then cut vertically along the 12 o'clock line and separate to allow for your gnomon thickness
, or enter Gnomon Thickness to expand template.
You can calculate and mark out dimensions for very large Sundials. For example, a garden sundial, with stones for hour marks, and wood or any large triangular object for the Gnomon.
Uncheck Full Scale
and use the running list of measurements below to mark out Hour and 15 minute increments around the circumference of the dial.
Cut and fix the Gnomon
(the triangular piece) to the sundial face, with base along 12 o'clock line, and latitude angle end at centre.
Place level in sunny area, with Gnomon pointing True North in Northern hemisphere, or True South in Southern hemisphere (as marked on gnomon template).
Use a clock or watch to adjust rotation to line up shadow with correct time.
Print a paper popup sundial
, cut and fold to test first.
You can re-shape the Gnomon, just don't alter the latitude angle, and keep the hypotenuse (sloping edge) straight.
Running measurements around circumference, at 15 minute increments, from 12 o'clock.
Chord Length measurements - Straight line lengths between 12 o'clock and each 15 minute increment.
Hour angles from 12 o'clock. (Vertical)
To mark out a large garden Sundial:
Make a paper popup sundial
first, to test alignment and see how the full scale sundial will look and fit.
Hit 'Find Latitude + Longitude' to display world map. Click map at your sundial location then hit 'Draw Sundial' to calculate and draw the template with correct Magnetic and True North or South lines.
Using a compass, lay a rope (or hose) along the True North or True South line (Gnomon line), with the start of the line being the centre of the base of the sundial.
Insert a peg/pin at the base of this line, tie a rope or string to the peg, and tie a marker (peg) at the length you want to be the radius of the Sundial.
Pull the rope taught and use the marker to mark out the circumference semicircle (outer curved edge) of the sundial, 90° each side of the centre line.
Lay a rope or hose around the semicircle, or just mark the ground.
Use the running list of measurements from the calculator to mark out and number the Hour points around the sundial face, matching the numbers from the template.
Construct the Gnomon to the calculated dimensions and stand vertically along the centre line.
If you're cutting blocks, concrete, stone or ANYTHING
and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST
- Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray mist too!
Built something using our calculators?
Please Send Photos!