Alunar occultation occurs when the Moon appears to move in front of something more distant, such as a star or a planet. Lunar occultations of brighter objects aren’t as common as you might think, but this month, on the night of 23/24 May, the bright full Moon will occult the globular cluster Messier 4 in the constellation of Scorpius. However, M4’s magnitude of +5.9 and low altitude from the UK mean this won’t be straightforward.
If you try to follow the event using binoculars, the Moon’s glare