Terms & Abbreviations: D

Dahlen, J. M.

Member of the MIT Instrumentation Lab. Director, Systems Engineering Division, Apollo Guidance and Navigation Program.

DAP

Digital Autopilot.

Delta-v

The amount of change in velocity required to change a spacecraft's trajectory in a certain way.

Dick Battin

See Battin, Richard

DOI

Descent Orbit Insertion. A LM maneuver performed to reduce the altitude of its orbit in preparation for landing.

DPS

Descent Propulsion System.

Dr. Battin

See Battin, Richard

DSKY

The "Display and Keyboard" interface through which the astronauts controlled their guidance computers.