Nadir

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CenitNadir.gif

The nadir is the point on Earth directly beneath a satellite, the opposite of zenith. Compare with subsatellite point.[1]

Etymology: Middle English, from Middle French, from Arabic naḍhīr opposite Date: 15th century.[2]


References[edit]

  1. ↑ NASA Earth Observatory glossary
  2. ↑ Nadir Merriam-Webster Online Dictionary

Categories: [Astronomy]

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