Not sundial related, but at least about time. I also agree that this is a great list. Happy Puzzling!
> Two friends, George and Harry, were born in May, one in 1964 and the other > a year later. Each has an antique 12-hour clock. One clock loses 10 > seconds an hour and the other gains 10 seconds per hour. On a day in > January the two friends set both clocks right at exactly 12 noon. "Do you > realize, " says George, "that the clocks will drift apart and won't be > together again until ... good grief, your 23rd birthday!" How long will > it take for the two clocks to come together again? Which friend is older, > George or Harry? >
