After sailing westward around the world from Spain, the expedition called at Cape Verde for provisions on Wednesday, 9 July 1522 (ship's time). This phenomenon was confirmed in 1522 at the end of the Magellan–Elcano circumnavigation (1519–1522), the first successful circumnavigation. The Arab geographer Abulfeda (1273–1331) predicted that circumnavigators would accumulate a one-day offset to the local date. Back by 24 hours upon crossing the International Date Line.įailing to do this would make their time inaccurate to the local time.Forward by one hour for every 15° of longitude crossed, and.People traveling eastward must set their clocks: Forward by 24 hours upon crossing the International Date Line.Back by one hour for every 15° of longitude crossed, and.People traveling westward around the world must set their clocks: Night and day is illustrative only daylight hours depend on latitude and time of year.) Circumnavigating the globe (Times are approximate, since time zone boundaries generally do not exactly coincide with meridians. Example depicting situation at 04:00 GMT Tuesday.
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