This event is an astronomical phenomenon that occurs when a planet passes in front of a star, temporarily blocking its light. Planetary occultations of Venus occur when the planet Venus passes between an observer and a star, obscuring the star from view. During this event, the star will appear to dim
From Wikipedia
In astronomy, planetary transits and occultations occur when a planet passes in front of another object, as seen by an observer. The occulted object may be a distant star, but in rare cases it may be another planet, in which case the event is called a mutual planetary occultation or mutual planetary transit, depending on the relative apparent diameters of the objects.