A gathering involving celestial bodies, most predominantly planets, is classified as a conjunction and represents a very dramatic sight when looking overhead. Planets by their nature are generally the brightest specks of light in the overhead sky and, therefore, easily stand out on their own. This is especially true when two or more planets are in proximity to each other ranging from less than a degree to tens of degrees spanning the eastern or western sky.

Strange as it may sound, Mercury is the least observed planet using the naked-eye and this includes professional astronomers and which is attributed to the planet's close proximity to the Sun. As a result, conjunctions involving Mercury and one of the other planets is a great means to catching this elusive planet once the sun has yet to rise in the east or has already set in the west.

Conjunctions are particularly impressive when they involve the most dominant celestial body of the night sky, namely the Moon, and where one can observe a variable juxtaposition between the Moon and one or more planets from evening to evening.