When a nearby astronomical body passes between the observer and a more distant object, see say that an occultation is taking place. Since the Moon is our nearest celestial neighbour, it regularly passes in front of planets and stars. Observers in the British Isles can see naked-eye star Zeta (ζ) Tauri glide behind the Moon on Saturday, 19 October 2019.
Globular clusters are favourite targets for amateur astronomers, vast star swarms that date back to just after the big bang birth of the cosmos. NGC 6397 is one of the closest, as revealed by the Hubble Space Telescope.