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altazimuth coordinate system

(Encyclopedia)altazimuth coordinate system ăltăzˈəməth [key] or horizon coordinate system, astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an obs...

International Maritime Organization

(Encyclopedia)International Maritime Organization (IMO), specialized agency of the United Nations established in 1948, with headquarters in London and 168 member nations and three associate members. IMO is one of t...

International Refugee Organization

(Encyclopedia)International Refugee Organization (IRO), temporary agency of the United Nations, established in 1946. In arranging for the care and the repatriation or resettlement of Europeans made homeless by Worl...

international date line

(Encyclopedia)international date line, imaginary line on the earth's surface, generally following the 180° meridian of longitude, where, by international agreement, travelers change dates. Traveling eastward acros...

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