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| Powered Descent Initiation ： ウィキペディア英語版 |
Powered Descent Initiation
Powered Descent Initiation (PDI) is a term used during the Apollo Moon landing missions to describe the maneuver of the Apollo Lunar Module as it descended from lunar orbit to landing.
"''Eagle'' was GO to ignite its descent engine, and Armstrong and Aldrin locked their eyes to the glowing numbers displayed before them. They were almost at an invisible junction of height, speed, range, and time when everything would join together for commitment. When the instruments told them that they were 192 miles from their projected landing site, and were precisely 50,174 radar~measured feet above the long shadows of the moon, they would unleash decelerating thrust and begin slowing their speed for the touchdown.....this was it. PDI. Powered Descent Initiate."〔Moon Shot The Inside Story of America's Race to the Moon, Alan Shepard/Deke Slayton Page 17 First Edition〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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