I'll have to study astronomy,why...?

Today I received an e-mail from Nayoro. The mail says the organizers of the international snow sculpting competition will take the participants in the competition to Nayoro Astronomical Observatory. As an interpreter, I'll have to go with them, and play a role as an interpreter there. There will be, of course, explanations about constelations,stars,asteroids,galaxies, satelites, etc. I have little knowledge about astronomy, so I have no confidence at all. Anyway, I have to prepare for it.
I found Mr.Koshito's twitter through Mr.Miyawaki's twitter. Both Mr.Koshito and Mr.Miyawaki are my old students I taught in Tomakomai Higashi Senior High School. I wrote to Mr.Koshito, and then,quite pronptly,he answered me. One thing that I worry about in his mail is that Miss Mokudai,one of their classmates, is suffering from breast cancer, and her condition is very serious.