There are two basic tie-in knots climbers should be familiar with: The figure-eight follow-through, or “trace eight,” and the double bowline with a back-up. Heather Weidner, pro climber, explains the ...
Apollo missions utilized a figure-8 trajectory primarily for safety reasons, leveraging the Moon's leading edge for a gravitational assist that facilitated a free-return path to Earth. Approaching the ...
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