SITUATED barely 100 miles (160km) south of the Tropic of Capricorn, you might expect Johannesburg, South Africa's commercial capital, to be bathed in tropical heat all the year round.

读者可能会猜想位居南回归线以南近100英里（160公里）的南非商业首都约翰内斯堡一年四季都沐浴在热带高温之中。

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For cartographers, the tropical belt is defined quite simply by the tropics of Cancer and Capricorn, at latitudes 23.5 degrees north and south of the equator.

为制图员，热带定义很简单，由热带地区的癌症和南回归线，在北纬23.5度，北部和南部的赤道。

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