On Mars, you'll get extra time in the day to do the things you want to do--like sleep in! Martian days are about half an hour longer than Earth days. But that's nothing compared to the extra time you'll get in a year--687 days versus only 365 days on Earth.

The above is an excerpt from a kid book and can also be found on the website below: https://www.windows2universe.org/kids_space/lifeonmars.html

I wonder why the definite article was used in this case.

You will have extra time in a day on Mars

also sounds ok to me.

Maybe "a day" indicate "a single day on Mars"?

I am so lost here and would be really grateful if someone can help me understand this issue. Thank you

  • I think that both ways work here. With the, the sentence is referring to the "generic" day. With a, it's referring to "any day". I've added the "generic-noun-phrases" tag, you can look at question concerning this topic. – CowperKettle Nov 8 '18 at 2:53
  • in the day is the same as during the day, in my opinion. – Lambie Feb 24 '19 at 17:08

I believe in this case "the day" is being used as the daytime hours, the opposite of night where "a day" generally refers to the entire 24 hours, night and day.

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