Don't worry if you miss an hour, you can estimate where that hour is by seeing how far there is between the shadows of the other hours. Once you have marked down where all the daytime hours are, you will have a fully working sundial.
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See Examples. If you've benefited from this free service please consider helping us support:. Inch or Metric? Please help promote this free service Tell a Friend! Saved Calculations Select Saved Calculation. Reply 5 years ago. Reply 10 years ago on Introduction. Did you check to make sure the gnomon's angle was the same as your latitude after you attached it? A photo directly from the side might help to diagnose this.
How did you check for north? Did you correct the compass reading for the magnetic deviation at your location? Did you correct for daylight savings if needed? Reply 9 years ago on Introduction. Unlike widely believed wisdom, the deviation of the compass reading and the true north is not minute at all, and, instead, may be quite considerable.
For example, in Vancouver, B. If one uses the compass without the magnetic deviation adjustment, the error in the sundial reading will be more than 1 hour! Reply 6 years ago on Introduction. Can you give me your time zone, latitude and longitude feel free to round off to the nearest half degree for privacy and I can experiment a little? Introduction: minute Paper-craft Sundial. By arpruss Follow. More by the author:.
This is a minute paper sundial in two senses: it takes minutes to make and is labeled to the nearest minutes. It is made of paper, but I designed the gnomon to have a three-dimensional base for greater stability, tapering to a thin top for better accuracy around noon. The hard work was my doing the trigonometry for the three-dimensional paper-craft gnomon and writing a perl script that generates a pdf file for a particular location. But with the script written, you should be able to print out a sundial from the generator on my website and construct it in fifteen minutes.
Ingredients and tools: Two sheets of paper, ideally cardstock or some other heavy stock. This is a much simpler project. The last one I assembled took 12 minutes once I had the design printed out and all the tools in place, and that's counting periodic stops to take photographs.
You can load the PDF file into a vector drawing application like Inkscape and make it fancier. Just make sure that if you resize the dial, you resize the gnomon the pointer in the same proportions. The script is open source so you can modify it as you see fit. You can presumably trace the printout on copper sheets to make a fancier dial and gnomon.
I'd love to see it. This would make a good classroom project at various levels, depending on how deep you get into explaining how it works. Note: The script currently works for latitudes between 24 degrees north or south and 65 degrees north or south. That covers all of the contiguous 48 states in the U. The limitations are due to the way the gnomon is designed to work both when shadows are short and when they are long, and its having a wider base.
Print both pages of the PDF file, ideally on heavy paper, e. Cut out the dial circle. If you like, you can glue it on a harder backing.
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