Today is Saturday.
Based on the information given, Arun goes to watch movies only on Thursdays. If he went for a movie nine days ago, we can count backwards from today to determine the day of the week it was.
Let's start counting backwards:
- Today is Saturday (Day 1)
- Yesterday was Friday (Day 2)
- Two days ago was Thursday (Day 3)
- Three days ago was Wednesday (Day 4)
- Four days ago was Tuesday (Day 5)
- Five days ago was Monday (Day 6)
- Six days ago was Sunday (Day 7)
- Seven days ago was Saturday (Day 8)
- Eight days ago was Friday (Day 9)
Therefore, if Arun went to watch a movie nine days ago, it was on a Friday.