The translation of Professor Hahn’s book Basic Calculus of Planetary Orbits and Interplanetary Flight, The Missions of the Voyagers, Cassini, and Juno, 2020, Springer, New York, NY into Japanese appeared in September 2023 in two volumes with Asakura Publishing Co.,Tokyo. Asakura Publishing, founded in 1929, is an academic and professional book publisher with a broad focus on mathematics, statistics, the sciences, engineering, medicine, humanities, and other disciplines.