85 (number) - Definition and Overview

85 is the natural number following 84 and preceding 86.

In mathematics

Eighty-five is an octahedral number, a centered triangular number, a centered square number, a decagonal number, and a Smith number.

85 can be expressed as a sum of two squares in two ways, 85= 9² + 2² = 7² + 6²

In science

• The atomic number of astatine

In astronomy,

Messier object M85, a magnitude 10.5 lenticular galaxy in the constellation Coma Berenices

The New General Catalogue object (http://www.ngcic.org/) NGC 85, a galaxy in the constellation Andromeda

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -170 March 14 and ended on 1110 April 20. The duration of Saros series 85 was 1280.1 years, and it contained 72 solar eclipses.

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -103 August 2 and ended on 1267 November 3. The duration of Saros series 85 was 1370.3 years, and it contained 77 lunar eclipses.

In other fields

Eighty-five is also:

• the model number of SU-85
• the number of the French department Vendée
• the designation of Interstate 85, a freeway that runs from Alabama to Virginia; the European route E85 from Klaipéda to Alexandropoúli
• The ISBN Group Identifier for books published in Brazil
• The title of a webcomic novel (http://www.number85.co.uk) created by Gemma Bright and Tammy Holliday.
• The year AD 85, 85 BC, or 1985.