In astronomy, geology, and paleontology, Gya (for giga years ago) is often used as an unit of time to denote length of time before the present. Specifically, one Gya is equal to 109 years ago.

A unit identical to Gya is bya (for "billion years ago"), which may be in more widespread use. However, some scientists prefer Gya because it uses the SI prefix giga- and thus avoids confusion over whether the short-scale (American) billion (109) or long-scale (British) billion (1012) is meant, as well as avoiding preference for one of the two definitions of billion over the other.

In some scientific literature, the term Gya has been replaced by Ga (Giga-annum).

See also

* annum
* Before Present
* bya
* mya (unit)

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Gya — Localidad de la India …   Wikipedia Español

  • Gya — Gya, ind. Stadt, s. Gaya 2) …   Meyers Großes Konversations-Lexikon

  • gya — gya·rung; …   English syllables

  • GYA — Guayaramerin, Bolivia (Regional » Airport Codes) * Greater Youngstown Area (Governmental » State & Local) …   Abbreviations dictionary

  • GYA — Guayaramerin, Bolivia internationale Flughafen Kennung …   Acronyms

  • gya — ISO 639 3 Code of Language ISO 639 2/B Code : ISO 639 2/T Code : ISO 639 1 Code : Scope : Individual Language Type : Living Language Name : Northwest Gbaya Macrolanguages : Identifier : (ISO 639 3) : gba Macrolanguages : Name : Gbaya (Central… …   Names of Languages ISO 639-3

  • GYA — Guayaramerin, Bolivia internationale Fughafen Kennung …   Acronyms von A bis Z

  • GYA —    a small town in Bihar, northern India, which is where the BUDDHA is believed to have received ENLIGHTENMENT. It is one of the four SACRED places for BUDDHIST PILGRIMS …   Concise dictionary of Religion

  • GYA — abbr. Gulf Yachting Association …   Dictionary of abbreviations

  • Gya (village) — Gya is a village overlooking river of same name in Indian Ladakh between the Indus river valley and Tanglang La Pass on the Leh Manali Highway. Reachable from Upshi in the Indus River Valley, the village nestles in the gorge created by the River… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.