1846
1846
Neptune and Pluto are not the same discovery at all.
it was unknown until they found a gravitational pull on Neptune
It was because of anomalies un Uranus' orbit that Neptune was discovered.
September 23, 1846
A year for Neptune is equal to 164.79 Earth years and a "day" is 16.1 Earth hours long. So a Neptune year is equal to 60,910 Earth days or 89,666 Neptune days. Interesting fact : there has not been one full Neptunian year since its discovery in September, 1846. In late June of 2011, we will mark one "year" since its discovery.
Neptune has 60,190 number of days in a year.
Neptune and Pluto.
165 days makes a year on Neptune.
The planet Neptune has not completed a full orbit since its discovery in 1846. It takes Neptune approximately 165 Earth years to complete one orbit around the Sun, so it has only completed a fraction of its first orbit since its discovery.
There are no satellites or robots on Neptune.
A day on Neptune is 16 hours, 6 minutes and 36 seconds. A year on Neptune is 164.8 Earth years.i