An image of sunset on Mars, taken by Spirit, won in a public poll. This contest, and other new multimedia pieces, help mark the twin rovers‘ third anniversary on the red planet. On May 19th, 2005, NASA’s Mars Exploration Rover Spirit captured a stunning view as the Sun sank below the rim of Gusev crater on Mars. The Panoramic Camera (PanCam) mosaic was taken around 6:07 in the evening of the rover’s 489th martian day, or sol.

https://mars.nasa.gov/mer/gallery/press/spirit/20050610a.html