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    Old hydrographic office polar star map
    From: Jim Stephens
    Date: 2015 Dec 18, 10:54 -0800

    Anyone familiar with H.R. Mills' Positional Astronomy and Astro-Navigation Made Easy?  Page 61 describes "A Home-made Equatorial Device" constructed from two protractors.  One of the protractors is actually a star chart (page 64).  The text describes this as "a common type of syar map with polar coordinates, favored by navigators for star identification, and formerly published by the Hydrographic Office, Washington D,C., under the authority of the U.S. Navy."  (By the time of the book's publication (1978) the hydrographic Office had been superseded by the Naval Oceanographic Office.)  I haven't seen a star chart like this and would like to find one, anyone familiar with its name?

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