Rachel – are there any sundials in your area? We have one in the courtyard of Blackrock Castle and I know there is one in the middle of Mitchelstown in north Cork.
This site might help you check: https://www.sundials-ireland.com/ireland.htm
How would you align the paper plate sundial with north on the next day? Do you have a picture of one you have made? It looks like a nice design and make, although the science is probably best for 2nd class and up.