The two astronomers spend time with Nevil Maskelyne, who is on the island to make observations but suffers from faulty equipment. Despite political and personal differences, they belatedly celebrate Maskelyne's 29th birthday. Dixon is ordered to return alone to Cape Town, while Mason comes to terms with his orders to remain on St. Helena. Two clocks, one having been with Maskelyne during the transit, the other with Mason and Dixon, discuss the differences between the two locations and the particular behaviors of the titular heroes. The episode closes with Dixon departing for the Cape with the clock previously kept by Maskelyne, leaving behind Mason and the other clock.