[PAR] [TLE] Isabel Martin Lewis [SEP] Isabel Martin Lewis (July 11, 1881 – July 31, 1966) was an American astronomer who was the first woman hired by the United States Naval Observatory as assistant astronomer.  In 1918, Lewis was elected a member of the American Astronomical Society.  She was also a member of the Royal Astronomical Society of Canada and the Astronomical Society of the Pacific. [PAR] [TLE] United States Naval Observatory [SEP] The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing (PNT) for the United States Navy and the United States Department of Defense.  Located in Northwest Washington, D.C. at the Northwestern end of Embassy Row, it is one of the pre-1900 astronomical observatories located in an urban area; at the time of its construction, it was far from the light pollution thrown off by the (then-smaller) city center.  The USNO operates the "Master Clock", which provides precise time to the GPS satellite constellation run by the United States Air Force.  The USNO performs radio VLBI-based positions of quasars with numerous global collaborators, in order to produce Earth Orientation parameters.
[PAR] [TLE] Isabel Martin Lewis [ SEP ] Isabel Martin Lewis ( July 11 , 1881 – July 31 , 1966 ) was an American astronomer who was the first woman hired by the United States Naval Observatory as assistant astronomer . In 1918 , Lewis was elected a member of the American Astronomical Society . She was also a member of the Royal Astronomical Society of Canada and the Astronomical Society of the Pacific . [PAR] [TLE] United States Naval Observatory [ SEP ] The United States Naval Observatory ( USNO ) is one of the oldest scientific agencies in the United States , with a primary mission to produce Positioning , Navigation and Timing ( PNT ) for the United States Navy and the United States Department of Defense . Located in Northwest Washington , D.C. at the Northwestern end of Embassy Row , it is one of the pre-1900 astronomical observatories located in an urban area ; at the time of its construction , it was far from the light pollution thrown off by the ( then - smaller ) city center . The USNO operates the " Master Clock " , which provides precise time to the GPS satellite constellation run by the United States Air Force . The USNO performs radio VLBI - based positions of quasars with numerous global collaborators , in order to produce Earth Orientation parameters .
In which year did first woman hired by the agency that operates the "Master Clock" become an American Astronomical Society member?
In which year did first woman hired by the agency that operates the " Master Clock " become an American Astronomical Society member ?
1918
1918