Definitions
ZD Tweet Definition of ZD Like Definition of ZD on Facebook
abbreviation 
  1. zenith distance(ref, Acronym_Finder)
z_t is now ZD (true zenith distance)
:--California Institute of Technology(ref, California_Institute_of_Technology)
limit in zenith distance ZD: ZD < 70°
:--European Southern Observatory(ref, European_Southern_Observatory)

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