Zeitzonen
7 cards from across every topic, each citing a source. Tap one to open it in the feed.
- How to derive a place's time zone from its longitude.
Earth turns 360° in 24 hours, so 15° per hour. Ideal time zones are 15° wide, 7.5° either side of a central meridian …
- In western China the sun sometimes rises at 10 a.m.
China spans roughly 5,000 km from east to west, geographically five time zones. Officially, since 1949, only Beijing …
- Nepal runs 45 minutes ahead of the rest.
Time zones don't have to be whole hours. Since 1986 Nepal has used UTC+5:45, aligned with the longitude of Mount …
- One country simply moved the International Date Line.
The date line roughly follows the 180th meridian but takes big detours. Until 1994 Kiribati straddled it: the west had …
- Spain has lived in the wrong time zone since 1940.
Geographically, mainland Spain belongs to Greenwich time like Portugal and Britain. On 16 March 1940 Franco moved the …
- Two islands, 3.8 km apart, 21 hours of time difference.
The Diomede Islands sit in the Bering Strait: Big Diomede belongs to Russia, Little Diomede to the USA, 3.8 km apart at …
- Which country has the most time zones? Not Russia.
France uses twelve time zones, more than any other country. The reason is its overseas territories: French Polynesia in …