This essay collection, written from the perspective of the author, a physicist and director of an astronomical observatory, intertwines specialized knowledge with everyday scenes, exploring themes such as "The Moon and Music," "War and Planetariums," and "Mathematics and Effort." The end of the book includes a recording of the author's appearance on the NHK Radio Midnight Express, revealing their wartime experiences and the core of their educational philosophy. Thank you for viewing. I am selling this book after having read it. I have read it once, and I believe it is in good condition with no noticeable stains. Please understand that it has been stored at home. Also, returns and exchanges are not accepted. Thank you for your understanding.