MarsDial（火星日晷）

The MarsDial is a sundial that was devised for missions to Mars. It is used to calibrate the Pancam cameras of the Mars landers. MarsDials were placed on the Spirit and Opportunity Mars rovers, inscribed with the words "Two worlds, One sun" and the word "Mars" in 22 languages.The MarsDial can function as a gnomon, the stick or other vertical part of a sundial. The length and direction of the shadow cast by the stick allows observers to calculate the time of day.The sundial can also be used to tell which way is North, and to overcome the limitations of a magnetic north different from a true north.

需要自行涂色，图形和文字建议使用附加文档制作水转印贴纸。