This image of the Martian sundial onboard Spirit was processed by the Student Astronauts to impose hour markings on the face of the dial. The position of the shadow of the sundial's post within the markings indicates the time of day and the season, which in this image is 12:17 p.m. local solar time, late summer. The Student Astronauts are a team of 16 students from 12 countries selected by the Planetary Society to participate in the Mars Exploration Rover program.   (52/66)