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The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
For Inch versions, directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.

Full Scale Printable Horizontal Sundial Templates + Calculate and Set out Large Sundials for Gardens etc - Inch

Select Hemisphere and enter your Latitude. Select Full Scale and hit Calculate to draw a full scale Sundial Template.


Hit 'What's my Latitude' to find on map
Expand template to allow for Gnomon Thickness
Enter Latitude Degrees, Minutes and Seconds and hit Convert Decimal to convert to decimal degrees, and auto enter into Latitude box of Sundial Calculator.



Sundial orientation The Gnomon on your sundial needs to point to True North in the Northern Hemisphere, or True South in the Southern Hemisphere.
Hit What's my Latitude ? then click your location on the map or drag pointer to orient your sundial.
This will also add a red Magnetic North or South line to the template, adjusted for your selected location.
Align this Magnetic North or South line with your compass North or South to 'Set' the sundial time.
Watch This Video to learn about compasses, true north and declination angles.

Latitude Diameter

For full scale templates, check Full Scale. 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).

Allow for Gnomon Thickness 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.

Very large garden sundials 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 Hours 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 center. 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 sundial 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:
Paper popup sundial Make a paper popup sundial first, to test alignment and see how the full scale sundial will look and fit.
Hit 'Find Latidude + 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 center 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 center 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 center line.

DON'T BREATH THE DUST 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!

How should we spell it?


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Zoom out to fit large full scale template images on screen - or to adjust scale to match ruler held against screen
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Zoom to adjust screen scale to actual size (measure full scale diagram with ruler) and hit 'Set' to set scale on other pages.

Click Slider to select then use keyboard cursor keys to fine tune.
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Inch or Metric? 👈
The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
Directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.

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