What three distinctions determine who witnessed the *first* supernova, according to the text?

Answer

The first one ever to occur, the first one observed by humanity, or the first one detectable with modern tools.

Determining who witnessed the first supernova depends entirely on the context: whether it means the first one ever to occur, the first one observed by humanity, or the first one that can now be detected using modern tools looking back in time.

What three distinctions determine who witnessed the *first* supernova, according to the text?
Historyastronomystarsupernovawitness