The Number 1686: Properties and MeaningsPrime Factors of 1686=2x3x281.
1686 De Sitter is a main-belt asteroid discovered by Van Gent.
Kosmos 1686 also known as TKS-4, was a heavily modified TKS spacecraft which docked unmanned to the Soviet space station Salyut 7.
Lectionary 1686 is a Greek manuscript of the New Testament, written on paper leaves.
The Year 1686 ADIn the year 1686 AD the Municipality of Ilagan was founded in the Philippines.
In the year 1686 AD the Café Procope, which remains in business in the 21st century, was opened in Paris by Procopio Cutò as a coffeehouse.