Arbitrary, although I do happen to have a green 1935 almanac on my desk at the moment.
....men alla söndagar är skrivna i rött
( I find it strange that public holidays are called 'röda dagar', just because that's the colour that represents them on (some) calendars!)
It's rare to find Swedish calendars where sundays and public holidays aren't marked red, so I guess it just makes perfect sense to us Swedes.
Varför funkar inte 'almanackor' här? Jag tror att det är vanligare än kalendrar
Jag tror att "almanackor" var vanligare förr. Nu är vi så påverkade av engelskan, men i den omvända översättningen borde "almanackor" vara godkänt åtminstone.
But they're different things - an almanac will always contain a calendar, but never vice versa. In fact, it was illegal to publish almanacs in Sweden unless you had royal permission - as late as in the 1970s! :)
That said, a lot of people obviously use the words interchangeably.
Yup! I have one here beside me that happens to contain some veterinarian advice. It starts by pointing out how important it is not to hire kvacksalvare. It also knows only roughly how many people live in Sweden, but the exact number of pigs.
In America, many people don't know what an almanac is. The only commonly-known or referenced one is Poor Richard's, at least in the region where I live....
This sentence doesn't make sense in English. My calendars are green. I don't think anyone ever has, nor ever will say this!
Why? English people never talk about their calendars or do they all have pink calendars?
What I find more unusual is the idea of calendars in plural. Where I'm from a calendar is stuck on the wall. I can't imagine I would ever need more than one! Maybe some people collect them, green ones, then you could say, "all my calendars are green." Haha :)
Edit: Oh, oh! Perhaps this is someone who sells calendars! Green only! :)
Calendar on the wall. Calendar at work. Pocket calendar. However, none of them are green. :-)
What Duolingo aims for is not to teach you everyday-life sentences to learn by heart, but rather to make you understand single and individual concepts for you to become capable of using them in every way you feel like and combine them in the way you need them. Unsual (but grammatically correct) sentences do play an important role in that.