Lunar occultation of Venus
The lunar occultation of Venus refers to a natural phenomenon in which the Moon passes in front of Venus, obstructing it from view on some regions of the Earth. Since the orbital planes of both the moon and Venus are tilted relative to the ecliptic, occultations only happen about twice a year rather than once a month.
Source: Wikipedia — Lunar occultation of Venus (CC BY-SA 4.0)