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02132_Field_arc minute, arc second.txt
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1995-11-04
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arc minute, arc second: Units of
angular measurement. A circle drawn
entirely around the sky is divided
into 360 degrees. Each degree is
divided into 60 arc minutes, each arc
minute into 60 arc seconds. The Sun
and full Moon, for example, are each
about 30 arc seconds in size, or one
half an arc minute.