👉 A postscenium is a type of astronomical diagram used to visualize the positions and movements of planets, stars, and other celestial objects in relation to each other. It is named after its use as a tool for visualizing the positions of the Sun and Moon on a clear night sky. The term "postscenium" refers to the position of the Sun or Moon at the end of a long period of time when it was first visible from the Earth, or during a lunar eclipse.
