18 (number)

18 (eighteen) is the natural number following 17 and preceding 19.

In science

• The atomic number of argon

In astronomy,

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: Messier object M18, a magnitude 8.0 open cluster in the constellation Sagittarius

Related Topics:
Messier object - M18 - Magnitude - Open cluster - Sagittarius

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: The New General Catalogue object NGC 18, a double star in the constellation Pegasus

Related Topics:
New General Catalogue - NGC 18 - Star - Constellation - Pegasus

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:The Saros number of the solar eclipse series which began on -2416 June 2 and ended on -1118 July 21. The duration of Saros series 18 was 1298.1 years, and it contained 73 solar eclipses.

Related Topics:
Saros - Solar eclipse - -2416 - June 2 - -1118 - July 21

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:The Saros number of the lunar eclipse series which began on -2078 April 2 and ended on -780 May 21. The duration of Saros series 18 was 1298.1 years, and it contained 73 lunar eclipses.

Related Topics:
Lunar eclipse - -2078 - April 2 - -780 - May 21

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