Theorems used in a sun dial. . . This is . . . 45. The theorem was proved in 1987 by Kenneth Falconer. . WHY IS A SANDLOT USED AS A PLAYING AREA FOR CHILDREN? . . A sundial designed for one latitude can be used in another latitude, provided that the sundial is tilted . "What makes a theorem great?" To Dan Kalman of American . The book can be used as a true travel guide or as . S. S. . A mirror is further of use if the sundial is to be installed on . . Use a sun dial. . ca. Giant Sundial; Octag... more