Thank you. My course over-simplified this, just translating to the English "this Tuesday".
I will remember these rules by thinking of 这(个)星期二 as "day 2 of this week" and 下个星期六 as "day 6 of next week".
But that raises another question: Sunday. For using "this/next/last week", does Chinese treat Sunday as part of the week it ends, or the week it starts? This would affect the meaning of saying "next Sunday" on a weekday, and saying "next Tuesday" on a Sunday.
Agreed.Sunday is always treated as the last day in a week in my area too. As different people have different perpectives about it, it would be more safe by telling the exact date rather than “这个/下个星期日".