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85 (Number)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 In astronomy, - Messier object M85, a magnitude 10.5 lenticular galaxy in the constellation Coma Berenices
- The New General Catalogue object NGC 85, a galaxy in the constellation Andromeda
- The Saros number 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 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:
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