third-order triangulation
51Royal Observer Corps — Ensign Active 1925–1996 Country …
52Donald Davidson (philosopher) — Donald Herbert Davidson Portrait of Donald Davidson by the photographer Steve Pyke in 1990. Full name Donald Herbert Davidson Born 6 March 1917(1917 03 06) Springfield, Massachusetts …
53Transit of Venus — A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and Earth, obscuring a small portion of the Sun s disk. During a transit, Venus can be seen from Earth as a small black disk moving across the… …
54Nordström's theory of gravitation — In theoretical physics, Nordström s theory of gravitation was a predecessor of general relativity. Strictly speaking, there were actually two distinct theories proposed by the Finnish theoretical physicist Gunnar Nordström, in 1912 and 1913… …
55Conservatism — This article is about conservatism as a political and social philosophy. For other uses, see Conservatism (disambiguation). Part of a series on …
56Telecommunications data retention — In the field of telecommunications, data retention (or data preservation) generally refers to the storage of call detail records (CDRs) of telephony and internet traffic and transaction data (IPDRs) by governments and commercial organisations. In …
57Public Land Survey System — Seal of the BLM The Public Land Survey System (PLSS) is a method used in the United States to survey and identify land parcels, particularly for titles and deeds of rural, wild or undeveloped land. Its basic units of area are the township and… …
58Technicolor (physics) — Beyond the Standard Model Standard Model …
59Ultra — (sometimes capitalised ULTRA) was the name used by the British for intelligence resulting from decryption of encrypted German radio communications in World War II. The term eventually became the standard designation in both Britain and the United …
60Radio-frequency identification — (RFID) is a technology that uses radio waves to transfer data from an electronic tag, called RFID tag or label, attached to an object, through a reader for the purpose of identifying and tracking the object. Some RFID tags can be read from… …
