Tropic of Capricorn years. In South America, whilst in the continental cratons soils are almost as old as in Australia and Southern Africa, the presence of the geologically young and evolving Andes means that this region is on the western side of the subtropical anticyclones and thus receives warm and humid air from the Atlantic Ocean. As a result, areas in Brazil adjacent to the Tropic are extremely important agricultural regions, producing large quantities of crops such as sugarcane, and the natural rainforest vegetation has been almost entirely cleared, except for a few remaining patches of Atlantic Forest. Further south in Argentina, the
Tropic of Capricorn year (it was at exactly 23° 27′S in 1917 and will be at 23° 26'S in 2045). See under circles of latitude for information. There are approximately 13 hours, 35 minutes of daylight during the summer solstice. During the winter solstice, there are 10 hours, 41 minutes of daylight. In southern Africa, where rainfall is reliable, farming is possible, though yields are low even with fertilisers. In Australia, areas on the Tropic have some of the most variable rainfall in the world and thus even the wetter areas cannot be generally farmed, since irrigation sources invariably dry up in drought