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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.〔(About the Pancam and calibration target )〕 The sundial design team included Bill Nye "The Science Guy," space artist Jon Lomberg, and astronomers Woodruff Sullivan, Steve Squyres, James Bell and Tyler Nordgren. ''Curiosity'' (MSL), the rover which landed on Mars in August 2012, used a spare sundial remaining from the Mars Exploration Rovers.〔(Rebecca Boyle - How A Sundial Lets Curiosity See Mars in Living Color (2012) - Poplular Science )〕 It has a new text that reads "Mars 2012" and "To Mars To Explore".〔 The ball is the nodus, the post is the gnomon.〔(Cornell University - Sundial )〕 The colors on the corners are for calibrating colors, and the inner circles for greyscale.〔 There is a mirrored section on the middle circle to reflect the sky.〔 The sundials are also "message artifacts"something for future human explorers.〔(Hawaii Tribune Herald - Big Island artist’s art to land on Mars, again )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「MarsDial」の詳細全文を読む スポンサード リンク
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