When looking up at the night sky, I could see small, beautiful twinkling things on clear days. These are the stars that light up the dark night sky. There are so many things from blue and bright to reddish and dark. Depending on the shape in which the stars are gathered, you can also draw constellations that have been handed down from ancient Greece. Depending on the Earth's revolution, the stars and constellations that can be seen vary by season. From late autumn to early spring, you can see many stars more clearly and brightly. The cool air in the atmosphere descends and the atmosphere acts like a convex lens. The light that passes through it is refracted more, so the stars appear more clearly than they do during other seasons.      When young, I had many opportunities to look up at the night sky. That time has passed now, it seems that there is not much time for doing that. There are plenty of excuses. I'd like to take time to look at the stars more...