3 ms·

>even above ground the light at mid-day is extremely dim. Direct normal insolation on Mars seems to be in the 590 W/m^2 range. https://duckduckgo.com/?q=590+W

• kibwen 6y ago
  I was about to argue that that seems pretty anemic for a best-case scenario, but it occurs to me that the lack of a substantial atmosphere probably means you do at least avoid any reduction in light as the sol goes on; Martian sunrise is therefore probably brighter than Earth sunrise. Even still, being able to see the Martian sky means being exposed to radiation for which no intervening atmosphere or magnetosphere exists to protect you. I don't think this changes much about a Martian settler's unlikeliness to prefer to set their clocks according to solar time.