MER/Curiosity Marsdial Camera Calibration Target

This is the Marsdial that is on board the Spirit and Opportunity as well as the Curiosity rover missions. It functions both as a mars sundial and provides a very accurate way to calibrate the color camera's on both missions. I modeled this from available official public technical documents and photos. Although the result is close, there are likely some dimensions that are off a little bit from the original flight model that went to Mars. :)