- Source: Bya
- Source: BYA
bya or b.y.a. is an abbreviation for "billion years ago". It is commonly used as a unit of time to denote length of time before the present in 109 years. This initialism is often used in the sciences of astronomy, geology, and paleontology.
The "billion" in bya is the 109 "billion" of the short scale of the U.S., not the long-scale 1012 "billion" of some European usage. Billion by this convention (109) is often called a "thousand million" in the UK and a "milliard" in some other countries. For this reason, there is potential for some confusion, and some scientists prefer the unit Gya, while others prefer Ga (Giga-annum), however, bya remains in more widespread use. In 1974, the UK switched from the long scale to the short scale.
Related units are mya ("million years ago"), and byr ("billion years"). These are traditionally written in lowercase. Ga or Gya has a capitalized first letter instead.
See also
Chronology
Myr
Before Present
References
BYA may refer to:
Black-Yellow Alliance, a monarchist movement in Austria
Brigham Young Academy, an American school
bya, a unit of time
BYA (airline), an American charter airline
BYA (railway station), a railway station serving the remote settlement of Berney Arms in the English county of Norfolk
Kata Kunci Pencarian:
- Gya
- Stasiun Buyaran
- Mudrā
- Katakana
- Hiragana
- Boudhanath
- Romaji
- Alih aksara Hepburn
- Daftar stasiun kereta api di Indonesia
- Slovak Government Flying Service
- Bya
- BYA
- Year
- Carnivore
- Don Byas
- David Byas
- Byas-Kyuyol
- Aïn Bya
- Rick Byas
- Subby Byas
