To tell time, you had to stand next to the month stone and face the number stones. Your shadow would fall across the number, revealing the time. If daylight savings time was in effect, you had to add an hour.
I tried it out and it worked! I was so thrilled.
Sundials work by casting a shadow across the correct time. Though we are the ones who rotate, the sun appears to move across the sky at by 15̊every hour. As the sun “moves” across the sky, the position of the shadow changes, thus revealing the time.
Sundials are easy to make. We used a flat foam board and a cardboard tube.