LEM | Lunar (Excursion) Module. Three days after embarking on the Trans Lunar Injection the Apollo spacecraft entered orbit around the Moon. Separating from the Command Service Module the LM descended to the surface with the Commander and Pilot standing at these controls in their full spacesuits. The descent and landing is well documented as one of the coolest pieces of flying by anyone anywhere. Like landing a telephone box, using the computing power of a Casio scientific calculator, onto a grey dust surface under a black sky…. with diminishing fuel and alarms going off.