In early January the sun does not rise in Kashgar, in China’s far west, until after 10am. Across the border, in eastern Afghanistan, it rises before 7am. That difference is the greatest jump in time across any land border on earth. By degrees of longitude Beijing, more than 3,000km to the east, should be about two and a half hours ahead of Kashgar. But when the People’s Republic of China was founded in 1949 it dropped the previous five official time zones and brought its citizens onto one, shared “Beijing time”.
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