What is a Planet Parade?

• Planet parade also known as Planetary alignment is a term referred to a rare positioning of planets in the solar system. 
• The planets gather closely on one side of the Sun at the same time, in such a way that all of them appear to come in a straight line.
• According to NASA, planetary alignment takes place when two or more planets come close together in the sky to form a conjunction, which is called ‘alignment’.