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80 (Number) | colspan=2| | | a href="/encyclopedia/Cardinal-number" title="Cardinal number">Cardinal | eighty | | a href="/encyclopedia/Ordinal-number" title="Ordinal number">Ordinal | 80th (eightieth) | | a href="/encyclopedia/Numeral-system" title="Numeral system">Numeral system | octagesimal | | a href="/encyclopedia/Factorization" title="Factorization">Factorization | | | a href="/encyclopedia/Divisor" title="Divisor">Divisors | 2, 4, 5, 8, 10, 16, 20, 40 | | a href="/encyclopedia/Roman-numeral" title="Roman numeral">Roman numeral | LXXX | | a href="/encyclopedia/Binary_numeral_system" title="Binary_numeral_system">Binary | 01010000 | | a href="/encyclopedia/Hexadecimal" title="Hexadecimal">Hexadecimal | 50 | | a href="/encyclopedia/Hebrew" title="Hebrew">Hebrew | פ (Pe) | 80 is the natural number following 79 and preceding 81. In mathematics 80 is a Harshad number In science In astronomy, - Messier object M80, a magnitude 8.5 globular cluster in the constellation Scorpius
- The New General Catalogue object NGC 80, a magnitude 12.1 spiral galaxy in the constellation Andromeda
- The Saros number of the solar eclipse series which began on 333 BC June 13 and ended on 929 July 9. The duration of Saros series 80 was 1262.1 years, and it contained 71 solar eclipses.
- The Saros number of the lunar eclipse series which began on 121 BC January 27 and ended on 1213 April 6. The duration of Saros series 80 was 1334.2 years, and it contained 75 lunar eclipses.
In other fields Eighty is also:
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