"Aerodynamic characteristics." . . "Drag." . . "Orbits." . . "Lift." . . "Artificial satellites." . . . . "Atmospheric perturbations on nearly circular satellite orbits"@en . . . . . . . . . "This report describes a simple technique for determining the effects of air drag on a nearly circular satellite orbit. Over any single orbit, the change in orbital period and radius can be obtained as a function of sub D A/M. Several graphs are included where Sub D 2 with observa tions of the ANNA 1b Satellite."@en . . . "Equations." . . "WOLF RESEARCH AND DEVELOPMENT CORP WEST CONCORD MASS." . .