After the arrival of Europeans and the introduction of the Gregorian calendar, it was noted that the Batswana people had started forgetting the name of the 13th month. In contrast to Europe, where the new year is in the middle of winter, in southern Africa it logically started in September or October at the start of the new growing season. Raditladi Basin, a large peak ring impact crater on Mercury with a diameter of 263 km is named after Leetile Disang Raditladi. a Motswana playwright and poet. Notable Batswana and people of Tswana descent Activism, authorship, academics and science Keorapetse Kgositsile – Late South African ANC activist, writer, author. Prof Dan Kgwadi – Vice-chancellor, North-West University Z. K. Matthews – Academic in South Africa, lecturing at the University of Fort Hare in 1955 Thebe Medupe – A physics professor at North West University Dr. Matshidiso Moeti – Regional Director of the WHO Regional Office for Africa Silas Molema – South African doctor, politician, author and activist Mamokgethi Phakeng – Vice-Chancellor of University of Cape Town Sol Plaatje – South African ANC activist, writer, author. Politics, royalty, activism, business and economics Duma Boko – He is a lawyer, jurist and politician. He is the president of the main opposition party in Botswana – Umbrella for Democratic Change. Frances Baard – Organiser of the African National Congress (ANC) Women's League and Trade Unionist Bathoen I – Former Kgosi (paramount chief) of the Ngwaketse Manne Dipico – first premier of Northern Cape province, South Africa Winkie Direko – former premier of Free State and former chancellor of University of Free State Unity Dow – Botswana former High Court judge, author, activist, Minister John Taolo Gaetsewe – Trade unionist, member of the ANC and General Secretary of SACTU, Robben Island prisoner, banned person Khama III – King of Bamangwato Ian Khama – Fourth President of Botswana Seretse Khama – First President of Botswana Moses Kotane – South African politician and activist David Magang – Botswana lawyer, businessman and politician Supra Mahumapelo – South African politician Mmusi Maimane – South African politician Toto Makgolokwe – Paramount chief (kgosi) of the Batlharo tribe of South Africa Lucas Mangope – Former President of Bophutatswana Quett Masire – Second President of Botswana Mokgweetsi Masisi – President of Botswana Joe Matthews – South African politician Naledi Pandor (née Matthews) – South African politician and minister Joe Modise – South