At a mighty 4.5 billion miles distance from the Sun, the planet Neptune takes its sweet time to orbit around the fiery center of our solar complete system. How long exactly? A Neptune year is close to an incredible 1
Since its discovery in 1846, Neptune has completed only one orbit around the Sun and completed its first full barycentric orbit on July 11, 2011. We will not see Neptune in a similar position until 2176.
Sun orbit is not the only thing that is particularly long on Neptune. The planet has an axial slope similar to the Earth and therefore experiences earth-like seasonal changes, with the seasons being about 40 years on Earth. If there were such an arrangement on earth, many of us would experience only two seasons of life.