Translation:Tuesday is the second day of the week.
If you're going to use American English as a basis for your English translations, then the days of the week should be ordered according to standard American usage, which is to have Sunday as the first day of the week. Only in the realm of business and a few other limited domains do you see Monday as the first day of the week in the US.
Perhaps, but regardless of whether you agree with the statement, the translation should be fine. Perhaps it's even a better exercise because it breaks your expectation and causes you to pay closer attention. We have a lot of sentences that are unusual or unlikely for just those reasons.