AFJ – The Apollo Flight Journal, which details missions before those that landed, and also covers in more detail the flight aspects of other missions. http://history.nasa.gov/afj/
AIA – Apollo Image Atlas. All mission photographs, many available in high resolution. http://www.lpi.usra.edu/resources/apollo/
ALSJ – Apollo Lunar Surface Journal. The essential resource for all things Apollo. http://www.hq.nasa.gov/alsj/frame.html
AOS – Acquisition of signal. The part of the lunar orbit when the orbiting CSM emerges
from the radio blackout of the far side of the moon.APT -
ATS – Applications Technology Satellite.
CAPCOM – Capsule communications. The Houston based personnel (usually astronauts) who acted as the sole voice link between mission control and the Apollo crew.
CSM (also CM) -
DAPP – Data Acquisition and Processing Program. Polar orbital satellites run by the US military in the 1960s, generally with higher resolution cameras. Also known as DMSP.
ESSA – Environmental Science Services Administration. Organisation managing environmental research in the USA. Also used as a satellite name (eg ESSA 7).
EVA – Extra-
GAP – Gateway to Astronaut Photography. Useful resource of high quality images. Not all Apollo images are available in high quality. http://eol.jsc.nasa.gov/
GET – Ground Elapsed Time. Time recorded on the ground since launch. See MET.
HEO – High Earth Orbit. Location for geostationary satellites around 24000 miles up.
ITOS – Improved TIROS Operational System.
LEO – Low Earth Orbit. Usually around 200-
LM – Lunar Module.
LOS – Loss of signal. The part of the lunar orbit where the CSM disappears behind the far side of the moon.
LRV – Lunar Roving Vehicle.
MET – Mission Elapsed Time. Time recorded since launch,
MWL – Mariner's Weather Log. A monthly journal for seafarers that frequently used satellite images in its reports.
MWR – Monthly Weather Review. A useful source of contemporary weather data and satellite images.
NASA – National Aeronautics and Space Administration.
NOAA – National Oceanic and Atmospheric Administration. Successor to ESSA.
TEC – Trans-
TEI – Trans-
TIROS – Television Infra-
TLC – Trans-
TLI – Trans-