45 (number)
Encyclopedia : 4 : 45 : 45N : 45 (number)
45 (forty-five) is the natural number following 44 and followed by 46.
| Cardinal | 45 forty-five |
| Ordinal | 45th forty-fifth |
| Factorization | [ 3^2 \cdot 5] |
| Divisors | 3, 5, 9, 15 |
| Roman numeral | XLV |
| Binary | 101101 |
| Hexadecimal | 2D |
In mathematics
Forty-five is a triangular number, a hexagonal and 16-gonal number, a Kaprekar number and a Harshad number.In science
- The atomic number of rhodium
Astronomy
- Messier object M45, a magnitude 1.4 open cluster in the constellation Taurus, also known as the Pleiades
- The New General Catalogue object NGC 45, a magnitude 10.6 spiral galaxy in the constellation Cetus
- The Saros number of the solar eclipse series which began on -1436 March 30 and ended on -156 May 7. The duration of Saros series 45 was 1280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -1369 August 19 and ended on 182 March 8. The duration of Saros series 45 was 1550.6 years, and it contained 87 lunar eclipses.
In other fields
Forty-five is also:
- The total of books in the Old Testament of the Holy Bible in the Catholic version if the Book of Lamentations is considered part of the Book of Jeremiah.
- The number of members of the Parliament of Tasmania in the year 1956, if the ones younger than 39 are discounted, and those whose surnames begin with 'S' are counted twice.
- In years of marriage, the sapphire wedding anniversary.
- In reference to gramophone records, 45 refers to a type of record by its revolution speed of 45 revolutions per minute (rpm). These small discs usually contained one song on each side which resulted in calling such records singles.
- *Originally the 45 RPM record was introduced as a longer play version of the 78 RPM discs. The first 45 RPM records were monaural with recordings on both sides of the disc. Produced in several sizes, the 7" large hole version became the most popular. As stereo recordings became popular in the 1960s, almost all 45 RPM records were produced in stereo by the end of the decade.
- *See also: 78, LP and 33.
- 45, the title of a book of essays by record producer Bill Drummond, derived both from the speed of a pop single and from his age when he finished writing it.
- The caliber of some handguns and cartridges. See .45.
- A card game: Forty-five
- The retired uniform number of former pitcher Bob Gibson
- Michael Jordan briefly wore jersey number 45 following his return from his first retirement.
- I-45 is the designation for a US interstate highway in Texas.
- The code for international direct dial phone calls to Denmark.
- The '45 refers to the 1745 Jacobite Rising in Great Britain.
- The year AD 45, 45 BC, and 1945.
- The forty fifth edition of the newspaper The North Briton published by John Wilkes, which the government attempted to supress, later becoming a symbol of support for him.
- Included in the title of "45 and Fat", a 1996 song by Babybird
- The title of a 2003 song by Shinedown, "45".
- In the 2002 September Dossier of the United Kingdom Labour government, the claim that Saddam Hussein could deploy weapons of mass destruction within 45 minutes of an order to use them.
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