Occupied is the past tense of occupy.
future
If you're asking this in English terms, the sun is an object (a noun). Nouns don't generally have tenses.
The past tense refers to something that has already happened. e.g. I danced. The present tense refers to something that is happening now. e.g. I dance. The future tense refers to something that will...
There is a past, present, and future. There was a past; there is a present and there will be a future.