But how does Nasa know with this sort of certainty that T CrB is going to erupt above the following couple of months exclusively? It is a make a difference of mathematical calculations and visible proof. As an example, the last time T CrB professional a nova was in 1946 https://econopass.com/news/science-technology/get-ready-for-a-stellar-show-nasa-predicts-summer-2024-nova-explosion/