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meridiaan

Definitions of meridiaan
  1. noun
    an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
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    examples:
    datumgrens
    an imaginary line on the surface of the earth following (approximately) the 180th meridian
    types:
    nulmeridiaan
    meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)
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