Geography of Brazil latitude), which crosses the country at the latitude of the city of São Paulo. Brazil has five climatic regions: equatorial, tropical, semiarid, highland tropical, and subtropical. Temperatures along the equator are high, averaging above , but not reaching the summer extremes of up to in the temperate zones. There is little seasonal variation near the equator, although at times it can get cool enough for wearing a jacket, especially in the rain. At the country's other extreme, there are frosts south of the Tropic of Capricorn during the winter (June–August), and there is snow in the mountainous areas, such as
The HAB Theory The novel borrows heavily from Brown's theory and book, which is that approximately every 6,000–7,000 years the Earth's polar ice caps become over-burdened with ice, creating such an imbalance in the planet's center of gravity, that the Earth's poles and the Earth's equator shift positions. The former poles are soon located somewhere between the Tropic of Cancer and the Tropic of Capricorn, where the weight of the polar ice cap leaves a large circular depression and other dramatic geological changes occur as the huge quantity of water is released by the ice caps melting. Called "capsizing" in the novel the