日晷
Churchyards often have sundials in them. 教堂大院里通常設置日晷。
Inventors created sundials, which indicate time by the length or direction of the sun's shadow, to track temporal hours during the day. 當時的發(fā)明家制造了日晷,利用太陽陰影的長度或角度,來測量白天真時的變化。