This type of sundial is very easy to set up. Once the gnomon is pointed at the North star and the dial is constructed at right angles to the gnomon, the sundial is set up in the right direction and elevation to give us equal gaps between the hour marks. The shadow falls on the lowest point of the dial at noon and will be a quarter of a turn anti-clockwise from the bottom at 6am and a quarter turn clockwise from the bottom at 6pm. We decided to make a big equinoctial sundial, because the bigger it is, the more accurate it will be. On top of that, the only suitable metal rings knocking around on the island were very big! Of course, experts will know that there are still small inaccuracies in measurement. Local time is usually slightly different to mean solar time because of the path that the earth uses to orbit the sun. These inaccuracies can be corrected by using the equation of time.