On January 20 (Sat.) and 21 (Sun.), 2024, we held an astronomy training for students from Suwa Seiryo High School, Suwa Futaba High School, Matsumoto Misuzugaoka High School in Nagano Prefecture, and Ena High School in Gifu Prefecture. The students estimated the distance to galaxies from photographs of galaxies and used the recession speeds of these galaxies to determine the age of the universe.