70 (number) - Definition and Overview

70 (seventy) is the natural number following 69 and preceding 71.

In mathematics

70 is a Pell number and a Harshad number. Its factorization makes it a sphenic number. It is the seventh pentagonal number and the fourth 13-gonal number. It is the smallest weird number.

In science

• The atomic number of ytterbium, a lanthanide

In astronomy,

Messier object M70, a magnitude 9.0 globular cluster in the constellation Sagittarius

The New General Catalogue object (http://www.ngcic.org/) NGC 70, a magnitude 13.4 spiral 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 -821 September 5 and ended on 676 February 19. The duration of Saros series 70 was 1496.5 years, and it contained 84 solar eclipses.

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -519 June 13 and ended on 761 July 21. The duration of Saros series 70 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

70 is:

• the designation of USA Interstate 70, a freeway that goes from Utah to Maryland.
• In miles per hour, a common speed limit for freeways in many American states.
• In years of marriage, the platinum wedding anniversary
• The registry of the U.S. Navy's nuclear aircraft carrier USS Carl Vinson (CVN-70), named after U.S. Representative Carl Vinson.
• The number of the French department Haute-Saône.
• The number of elders assembled by Moses on God's command in the desert (Holy Bible, Numbers 11:16-30).
• A member of a Quorum of the Seventy, General Authorities of The Church of Jesus Christ of Latter-day Saints.
• The year AD 70, 70 BC, or 1970.