I assume that include locations e.g.
- "Alpha station is space station", but "Polaris was a space station".
So the rule of the thumb would be: always write in the present tense (in/out of universe), unless the subject only appeared in a flashback.
Personally, I am used to in-universe past tense only wikis, and the above inconsistency irks me, But i'll try to match that when ever I am conscious of it.
Thanks for clarifying.