Q: What kind of trajectory was used? And why was it used over the Hohmann transfer? The time of flight to the moon on Apollo 11 was 100 hours, 39 minutes 53 seconds. The time of flight for a Hohmann transfer would have been 119 hours from my calculations. I've done some research and found a translunar injection was used. But I couldn't find ANY INFO on WHY it was used. Was it to reduce launch window? For safety reasons?