European exploration of Africa 1840s, so that around the midpoint of the 19th century and the beginning of the colonial Scramble for Africa, the unexplored parts were now limited to what would turn out to be the Congo Basin and the African Great Lakes. This "Heart of Africa" remained one of the last remaining "blank spots" on world maps of the later 19th century (alongside the Arctic, Antarctic and the interior of the Amazon basin). It was left for 19th-century European explorers, including those searching for the famed sources of the Nile, notably John Hanning Speke, Sir Richard Burton, David Livingstone and Henry Morton
David Stanley Evans position he held until his retirement in 1986. He received the Gill Medal of the Astronomical Society of South Africa in 1988. He wrote eight books including an introduction to astronomy. Evans died in Austin on 14 November 2004. At the time of his death, he had completed a book with Karen Winget on the eclipse expedition to Mauritania. David Stanley Evans David Stanley Evans (28 January 1916 – 14 November 2004) was a British astronomer, noted for his use of lunar occultations to measure stellar angular diameters during the 1950s. Evans was born in Cardiff, Wales on 28 January