accurate measurement
61History of geography — This article explores the history of geography.Ancient geographyAncient Greeks environment influenced on the ways people met their needs and the way their culture develops.The ancient Greeks saw the poet Homer as the founder of geography. His… …
62Redshift — This article is about the astronomical phenomenon. For other uses, see Redshift (disambiguation). Physical cosmology …
63Chain crew — Not to be confused with chain gang. The chain crew at work during a Rutgers Scarlet Knights football game …
64Ocean acoustic tomography — The western North Atlantic showing the locations of two experiments that employed ocean acoustic tomography. AMODE, the Acoustic Mid Ocean Dynamics Experiment (1990 1), was designed to study ocean dynamics in an area away from the Gulf Stream,… …
65earthquake — /errth kwayk /, n. 1. a series of vibrations induced in the earth s crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2. something that is severely disruptive; upheaval. [1300 50; ME erthequake …
66uncertainty principle — Physics. the principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other …
67Timeline of astronomy — Timeline of astronomy2500 BCMany ancient sites are thought to have astronomical significance, such as the Ancient Egyptian pyramids, Harappan shell instruments, British megaliths, and buildings in China and Latin America.In Lothal, the ancient… …
68Semiconductor process simulation — is the modeling of the fabrication of semiconductor devices such as transistors. It is a branch of electronic design automation, and part of a sub field known as technology CAD, or TCAD. 400px|right|thumb|This figure shows a result from… …
69Satellite laser ranging — In satellite laser ranging (SLR) a global network of observation stations measure the round trip time of flight of ultrashort pulses of light to satellites equipped with retroreflectors. This provides instantaneous range measurements of… …
70Chinese astronomy — The Dunhuang map from the Tang Dynasty (North Polar region). This map is thought to date from the reign of Emperor Zhongzong of Tang (705–710). Founded in Dunhuang, Gansu. Constellations of the three schools were distinguished with different… …
