You will need a 4x4x8 pressure-formed wooden post that has been outdoor-treated. It needs to be perfectly straight and have no large cracks in it. To mount it correctly, the top of the post must be cut with a precise angle. For example, if you are located at 40 degrees N.
Cut the angle into the post. Draw this line six inches from the top of the post. The line is the bottom side of the angle. Use a protractor to measure it, then cut the angle with a table saw. Dig a hole for the post. Find a sunny spot for your sundial and dig a hole for the post.
Put the post in the hole. Use a compass to make sure the angle you cut into the post is facing north. Allow a few days to go by before mounting the sundial face, so that the cement has dried completely. Attach the sundial face to the post. Tighten the screw enough so that it holds the face in place, but you are still able to turn the face easily. Use your right hand to screw the gnomon pipe into the flange, which you should hold in your left hand.
Rotate the sundial face so that the 6 a. Then align the gnomon so that those same lines look like they are going straight through the center. Make sure the line at 12 noon also looks like it is going directly through the gnomon. Set the time and attach the gnomon. You must set the time during Daylight Saving Time to read accurately. Hold the flange steady with your left hand.
Use your right hand to turn the sundial face. Check the current time. Keep turning the face until the shadow of the gnomon shows the same time on the sundial.
Use a pencil to mark where the four flange screws are and then take the flange away. Do not move the sundial face as you do this. Drill holes for the four screws and then screw the flange onto the sundial. Lastly, screw the gnomon in. Yes, of course! In fact, the flat, cardboard circles used to put under cakes are perfect for this!
Not Helpful 59 Helpful No, because a torch does not rotate around the sundial like the earth does around the sun. A sundial use the earth's rotation around the sun like a clock -- when the sun moves, so does the shadow.
Not Helpful 81 Helpful How far should the gnomon be slanting towards the closest celestial pole in degrees if 90 is directly up? Subtract your latitude from 90 to get the slant degree. I am at Rounding off to the nearest degree should work fine. Not Helpful 67 Helpful True North on a compass with not point geographically North, like the sun's shadow at noon would point.
This is because the magnetic North pole and the geographic North pole are two different places on the Earth's globe. Not Helpful 64 Helpful It is not practical to show minutes on a sundial.
It would be very tedious and time-consuming to return to the sundial every minute to mark the minute. Also, it would be impossible to fit every single minute of the day around the edge of the sundial. Not Helpful 60 Helpful Not Helpful 44 Helpful You can use a protractor to mark an hour every 30 degrees. As long as the number 12 and the straw in the middle of the plate are facing north, it should be fairly accurate. Not Helpful 40 Helpful Use a ruler, because it will allow you to determine if it truly is a degree angle.
Could I just measure the distance between the spaces of the first six hours, then just place the pebbles in the correlating spaces for the next 6 hours, cutting the time needed in half?
The angles are different for each hour, so it would be incorrect if you did that. Not Helpful 48 Helpful Put a stick in the ground and mark the end of the shadow with a rock. Return approximately 20 minutes later and mark the new location of the shadow.
True North will be halfway between those 2 points. Include your email address to get a message when this question is answered. By using this service, some information may be shared with YouTube. Submit a Tip All tip submissions are carefully reviewed before being published. You Might Also Like How to. How to. More References About This Article. Co-authored by:.
Co-authors: Updated: October 21, Categories: Clocks. Article Summary X To make a sundial with a paper plate and straw, first make a small hole in the center of the plate.
Italiano: Costruire una Meridiana. Deutsch: Eine Sonnenuhr bauen. It is the perfect project for a sunny, summer day. This sundial project is a perfect activity to go along with learning to tell time. I found this great SciKids video on YouTube that does a great job explaining how sundials work.
You can easily create this sundial with items you already have at home — essentially just a paper plate, pencil and our free printable sundial clock face. Obviously you need to take your sundial outside to use it. As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases. Be sure to pin this post for later and check out our Summer Pinterest board full of fun ideas like these….
Save my name, email, and website in this browser for the next time I comment. Instructions If using, paint the back of the paper plate and let dry completely. View page on Phone via QR Code. Or Right Click the slider and use the up down arrows that appear to adjust - Right click again to go back to the slider. Built something using this site? 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. Click individual diagrams to remove. Horizontal Sundial Templates.
Horizontal Sundial Paper Popup. Equatorial Sundial Templates.
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