Engineering topics
Publications and source records attributed to Armstrong, M. G..
Stand-alone subsystem calculates flight data analytically or numerically. System is orbit ephemeris generation program and is subsystem of comprehensive Goddard Trajectory Determination System (GTDS).
Information is presented to acquaint users of the Goddard Trajectory Determination System Solar/Lunar/Planetary ephemeris files with the details connected with the generation and use of these files. In particular, certain sections constitute a user's manual for the ephemeris files.