Archaeology, or archeology, is the study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts and cultural landscapes. Archaeology can be considered both a social science and a branch of the humanities. In North America archaeology is a sub-field of anthropology, while in Europe it is often viewed as either a discipline in its own right or a sub-field of other disciplines.
Archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology is distinct from palaeontology, which is the study of fossil remains. It is particularly important for learning about prehistoric societies, for whom there may be no written records to study. Prehistory includes over 99% of the human past, from the Paleolithic until the advent of literacy in societies across the world. Archaeology has various goals, which range from understanding culture history to reconstructing past lifeways to documenting and explaining changes in human societies through time.
The discipline involves surveying, excavation and eventually analysis of data collected to learn more about the past. In broad scope, archaeology relies on cross-disciplinary research. It draws upon anthropology, history, art history, classics, ethnology, geography, geology, literary history, linguistics, semiology, sociology, textual criticism, physics, information sciences, chemistry, statistics, paleoecology, paleography, paleontology, paleozoology, and paleobotany.
Archaeology developed out of antiquarianism in Europe during the 19th century, and has since become a discipline practiced across the world. Archaeology has been used by nation-states to create particular visions of the past. Since its early development, various specific sub-disciplines of archaeology have developed, including maritime archaeology, feminist archaeology and archaeoastronomy, and numerous different scientific techniques have been developed to aid archaeological investigation. Nonetheless, today, archaeologists face many problems, such as dealing with pseudoarchaeology, the looting of artifacts, a lack of public interest, and opposition to the excavation of human remains.
was a polymathic Chinese scientist
and statesman of the Song Dynasty
. Excelling in many fields of study and statecraft, he was a mathematician
, hydraulic engineer
, academy chancellor
, finance minister
, governmental state inspector, poet
, and musician
. He was the head official for the Bureau of Astronomy
in the Song court, as well as an Assistant Minister of Imperial Hospitality. At court his political allegiance was to the Reformist faction known as the New Policies Group
, headed by Chancellor Wang Anshi
. In his Dream Pool Essays
of 1088, Shen was the first to describe the magnetic needle compass
, which would be used for navigation. Shen discovered the concept of true north
in terms of magnetic declination
towards the north pole
, with experimentation of suspended magnetic needles and "the improved meridian
determined by Shen’s astronomical measurement of the distance between the polestar
and true north". This was the decisive step in human history to make compasses more useful for navigation, and may have been a concept unknown in Europe for another four hundred years
. Alongside his colleague Wei Pu
, Shen accurately mapped the orbital paths of the moon and the planets, in an intensive five-year project that rivaled the later work of the Danish
astronomer Tycho Brahe
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Delphi (; Greek: Δελφοί [ðelˈfi]), formerly also called Pytho (Πυθώ), is famous as the ancient sanctuary that grew rich as the seat of Pythia, the oracle who was consulted about important decisions throughout the ancient classical world. The ancient Greeks considered the centre of the world to be in Delphi, marked by the stone monument known as the omphalos (navel).