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What should it have said about time zones?

Big countries must have several timezones.

https://en.m.wikipedia.org/wiki/Time_in_Brazil says 93% of the population live in Brazil’s main time zone.

So what?

I was wondering how much the day length actually varies in Brazil. Isn’t most of the country near the equator?

The wikipedia article, but the news article is somewhat very scarse about this...