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If they are tidally locked as reported, then there will be no day, not really. Just as there is no day on the moon.

• strictnein 10y ago
  The moon rotates once every ~27 days, so its day is ~27 days. It's just in sync with its orbit of the earth, so it appears to us that it doesn't rotate. http://www.space.com/24871-does-the-moon-rotate.html http://www.space.com/24871-does-the-moon-rotate.html
  • visakanv 10y ago
    Isn't that technically the moon's "year"?
    • idbehold 10y ago
      A year generally refers to the time something takes to make one revolution around its closest star.