Maybe I am simply misunderstanding how the calculation is done, but shouldn't the sentence about the mariner at the top of page 35 read "His longitude is 1.5 x 15 = 22.5 degrees east of Toledo" (rather than 37.5 degrees west)? This puts the mariner somewhere off the Italian coast in the Mediterranean, rather than in the Atlantic. There are 1.5 hours between 10:30 and midnight, and if the mariner's time is later (midnight, vs 10:30 in Toledo), then isn't he to the east?
Maybe I am simply misunderstanding how the calculation is done, but shouldn't the sentence about the mariner at the top of page 35 read "His longitude is 1.5 x 15 = 22.5 degrees east of Toledo" (rather than 37.5 degrees west)? This puts the mariner somewhere off the Italian coast in the Mediterranean, rather than in the Atlantic. There are 1.5 hours between 10:30 and midnight, and if the mariner's time is later (midnight, vs 10:30 in Toledo), then isn't he to the east?