Senior Member
Dear Everyone,

Checking Curoisity's news in NASA's official website I found the word sol but I don't know what it means. It think it's a unit of measurement.

Here's the text:

Target: Jake Matijevic Rock

This image shows where NASA's Curiosity rover aimed two different instruments to study a rock known as "Jake Matijevic." The red dots are where the Chemistry and Camera (ChemCam) instrument zapped it with its laser on Sept. 21, 2012, and Sept. 24, 2012, which were the 45th and 48th sol, or Martian day of operations. The circular black and white images were taken by ChemCam to look for the pits produced by the laser. The purple circles indicate where the Alpha Particle X-ray Spectrometer trained its view.

…and it's source:

Thank you infinitely!

  • entangledbank

    Senior Member
    English - South-East England
    It actually explains it right there: the martian day. Things happen on Day 1, Day 2, Day 3, and so on. Mars and Earth have almost the same day length, but not quite, so higher numbers like 'Day 45' would be increasingly vague as the two day lengths get out of step. So they refer to the martian days as Sol 1, Sol 2, and so on. 'Day' is reserved for Earth days.
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