83 (number) - Definition and Overview

83 is the natural number following 82 and preceding 84.

In mathematics

Eighty-three is the sum of three consecutive primes (23 + 29 + 31) as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).

It is also the 23rd prime number, following seventy-nine and preceding eighty-nine, a Sophie Germain prime and a safe prime. It is also a highly cototient number.

In science

• The atomic number of bismuth

In astronomy,

Messier object M83, a magnitude 8.5 spiral galaxy in the constellation Hydra, also known as the Southern Pinwheel Galaxy

Southern Pinwheel Galaxy

The New General Catalogue object (http://www.ngcic.org/) NGC 83, a magnitude 12.3 elliptical 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 -210 May 5 and ended on 1052 May 30. The duration of Saros series 83 was 1262.1 years, and it contained 71 solar eclipses.

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -197 August 22 and ended on 1318 February 16. The duration of Saros series 83 was 1514.5 years, and it contained 85 lunar eclipses.

In other fields

Eighty-three is also:

• the hours in 83 Hours 'Til Dawn
• the model number of Bell XP-83
• the number of the French department Var
• the designation of Interstate 83, a freeway that runs from Maryland to Pennsylvania; European route E83 from Bjala to Sofia
• The ISBN Group Identifier for books published in Poland
• The year AD 83, 83 BC, or 1983.