Passage: The basic time periods from which the calendar is constructed are the Martian solar day (sometimes called a sol) and the Martian vernal equinox year, which is slightly different from the tropical year.  The sol is 39 minutes 35.244 seconds longer than the Terrestrial solar day and the Martian vernal equinox year is 668.5907 sols in length (which corresponds to 686.86 days on Earth).  The basic intercalation formula therefore allocates six 669-sol years and four 668-sol years to each Martian decade.  The former (still called leap years even though they are more common than non-leap years) are years that are either odd (not evenly divisible by 2) or else are evenly divisible by 10, producing 6,686 sols per ten years (668.6 sols per year).

Question: Sol is a translation for what kind of day in different planets atmospheres?
solar day