https://www.theregister.co.uk/2019/08/27/neptune/

As the world took down the bunting from the Apollo 11 celebrations, another anniversary rolled around: this weekend marked 30 years since Voyager 2 had its final planetary encounter, with Neptune.

The closet approach of the giant by the long-lived probe occurred on 25 August 1989 and represented humanity's first, and only, close-up look at the eighth, and farthest, planet in the Solar System.