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Lynds' Catalogue of Dark Nebulae (abbreviation: LDN) is an astronomical catalogue of dark nebulae. Objects listed in the catalogue are numbered with the prefix LDN (not to be confused with LBN, or Lynds' Catalogue of Bright Nebulae), from numbers 1 to 1802. [1] It was originally compiled in 1962 by American astronomer Beverly Turner Lynds. [2]
The ANT catalog [a] (or TAO catalog) is a classified product catalog by the U.S. National Security Agency (NSA) of which the version written in 2008–2009 was published by German news magazine Der Spiegel in December 2013. Forty-nine catalog pages [b] with pictures, diagrams and descriptions of espionage devices and spying software were