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Why a ship rolls back upright, until the cargo goes too high: the metacentre and the righting arm A loaded ship that leans over usually rolls back upright, because the water's upward push shifts sideways and twists her straight. But raise the cargo high… Engineering4 min read How sailors found longitude before satellites: a race against the clock Latitude is easy: measure the height of the Sun or the Pole Star. Longitude is hard, because the Earth turns one degree every four minutes. To know how far… History6 min read