TY - RPRT TI - Conceptual mechanization studies for a horizon definition spacecraft attitude control subsystem, phase A, part II, 10 October 1966 - 29 May 1967 AU - Hartman, D. J. AU - Knudtson, H. A., Jr. AU - Senechal, C. G. AU - Tesch, E. L. AU - Tidwell, N. W. PY - 1967 UR - https://ntrs.nasa.gov/citations/19670022761 ID - 19670022761 ER -