Lost at Sea: The Search for Longitude

"So, surely it's...

A.)...Havana!" (longitude: about 82 degrees west of Greenwich)
Close, but no cigar. Remember, Greenwich lies about 82 degrees east of Havana. If the Earth rotates from west to east at 15 degrees per hour, it's high noon in Havana about five and a half hours later than in Greenwich, not four hours forty minutes. Not only that, Havana lies at latitude 23 not 42 degrees north!

So, by your powers of deductive reasoning, you actually find yourself to be near...

D.) ...Cape Cod! (longitude: about 70 degrees west)
Greenwich lies about 70 degrees east of Cape Cod. If the Earth rotates from west to east at 15 degrees per hour, it's high noon on the Cape about four hours and forty minutes later than in Greenwich.

See if you can navigate your way to the correct answer in next week's NOVA Challenge.