Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!

Before Present

Index Before Present

Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events occurred in the past. [1]

28 relations: Ab urbe condita, After the Development of Agriculture, Anno Domini, Anno Mundi, Anthropocene, Archaeology, Carbon-12, Carbon-14, Common Era, Cosmic time, Dendrochronology, Epoch (astronomy), Geologic time scale, Geology, Hijri year, Holocene calendar, Hydrate, Isotopes of carbon, Metrology, National Institute of Standards and Technology, Nuclear weapons testing, Oxalic acid, Quaternary Geochronology, Radiocarbon (journal), Radiocarbon dating, Science, Stratigraphy, Year.

Ab urbe condita

Ab urbe condita or Anno urbis conditae (abbreviated: A.U.C. or AUC) is a convention that was used in antiquity and by classical historians to refer to a given year in Ancient Rome.

New!!: Before Present and Ab urbe condita · See more »

After the Development of Agriculture

After the Development of Agriculture (A.D.A.) is a system for counting years forward from 8000 BCE.

New!!: Before Present and After the Development of Agriculture · See more »

Anno Domini

The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.

New!!: Before Present and Anno Domini · See more »

Anno Mundi

Anno Mundi (Latin for "in the year of the world"; Hebrew:, "to the creation of the world"), abbreviated as AM or A.M., or Year After Creation, is a calendar era based on the biblical accounts of the creation of the world and subsequent history.

New!!: Before Present and Anno Mundi · See more »


The Anthropocene is a proposed epoch dating from the commencement of significant human impact on the Earth's geology and ecosystems, including, but not limited to, anthropogenic climate change.

New!!: Before Present and Anthropocene · See more »


Archaeology, or archeology, is the study of humanactivity through the recovery and analysis of material culture.

New!!: Before Present and Archaeology · See more »


Carbon-12 is the more abundant of the two stable isotopes of carbon (Carbon-13 being the other), amounting to 98.93% of the element carbon; its abundance is due to the triple-alpha process by which it is created in stars.

New!!: Before Present and Carbon-12 · See more »


Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

New!!: Before Present and Carbon-14 · See more »

Common Era

Common Era or Current Era (CE) is one of the notation systems for the world's most widely used calendar era – an alternative to the Dionysian AD and BC system.

New!!: Before Present and Common Era · See more »

Cosmic time

Cosmic time (also known as time since the big bang) is the time coordinate commonly used in the Big Bang models of physical cosmology.

New!!: Before Present and Cosmic time · See more »


Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in order to analyze atmospheric conditions during different periods in history.

New!!: Before Present and Dendrochronology · See more »

Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.

New!!: Before Present and Epoch (astronomy) · See more »

Geologic time scale

The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.

New!!: Before Present and Geologic time scale · See more »


Geology (from the Ancient Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.

New!!: Before Present and Geology · See more »

Hijri year

The Hijri year (سَنة هِجْريّة) or era (التقويم الهجري at-taqwīm al-hijrī) is the era used in the Islamic lunar calendar, which begins its count from the Islamic New Year in 622 AD.

New!!: Before Present and Hijri year · See more »

Holocene calendar

The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant (AD or CE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans transitioned from a hunter-gatherer lifestyle to agriculture and fixed settlements.

New!!: Before Present and Holocene calendar · See more »


In chemistry, a hydrate is a substance that contains water or its constituent elements.

New!!: Before Present and Hydrate · See more »

Isotopes of carbon

Carbon (6C) has 15 known isotopes, from 8C to 22C, of which 12C and 13C are stable.

New!!: Before Present and Isotopes of carbon · See more »


Metrology is the science of measurement.

New!!: Before Present and Metrology · See more »

National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.

New!!: Before Present and National Institute of Standards and Technology · See more »

Nuclear weapons testing

Nuclear weapons tests are experiments carried out to determine the effectiveness, yield, and explosive capability of nuclear weapons.

New!!: Before Present and Nuclear weapons testing · See more »

Oxalic acid

Oxalic acid is an organic compound with the formula C2H2O4.

New!!: Before Present and Oxalic acid · See more »

Quaternary Geochronology

Quaternary Geochronology is a peer-reviewed scientific journal addressing methods and results in the dating of samples from the Quaternary Period.

New!!: Before Present and Quaternary Geochronology · See more »

Radiocarbon (journal)

Radiocarbon is a scientific journal devoted to the topic of radiocarbon dating.

New!!: Before Present and Radiocarbon (journal) · See more »

Radiocarbon dating

Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

New!!: Before Present and Radiocarbon dating · See more »


R. P. Feynman, The Feynman Lectures on Physics, Vol.1, Chaps.1,2,&3.

New!!: Before Present and Science · See more »


Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification).

New!!: Before Present and Stratigraphy · See more »


A year is the orbital period of the Earth moving in its orbit around the Sun.

New!!: Before Present and Year · See more »

Redirects here:

BP cal, BP calibrated, Before Physics, Before Present Era, Before present, Before present day, Before the Present Era, Cal BP, Calibrated BP, Calibrated YBP, Geology timeline, Lookback time, Present Era, YBP, Ybp, Years BP, Years before present.


[1] https://en.wikipedia.org/wiki/Before_Present

Hey! We are on Facebook now! »