70 (number)

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, as well as a pentatope number. It is the smallest weird number.

In astronomy

• Messier object M70, a magnitude 9.0 globular cluster in the constellation Sagittarius
• The New General Catalogue object NGC 70, a magnitude 13.4 spiral galaxy in the constellation Andromeda
• The Saros number 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. Further, the Saros number 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 also:

• The atomic number of ytterbium, a lanthanide
• 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.