Dairy Sundial - First Steps

Having always had a shadowy(!) interest in sundials, when looking into commissioning one for the dairy, it occurred to me there was no reason, with some research, I couldn't make one myself. An hour or so's googling found a program that told me what angle my gnomon had to be set to (equal to your latitude), and a further program which provided the timelines for your longitude and latitude. The cows are courtesy of Caroline Bury, the artist - this tile was for her draft doodles for a large kitchen tile in the dairy.