Roald Dahl on 13 September is celebrated as "Roald Dahl Day" in Africa, the United Kingdom and Latin America. In honour of Dahl, the Royal Gibraltar Post Office issued a set of four stamps in 2010 featuring Quentin Blake's original illustrations for four of the children's books written by Dahl during his long career; "The BFG", "The Twits", "Charlie and the Chocolate Factory", and "Matilda". A set of six stamps was issued by Royal Mail in 2012, featuring Blake's illustrations for "Charlie and the Chocolate Factory", "The Twits", "The Witches", "Matilda", "Fantastic Mr Fox", and "James and the Giant Peach". Dahl's influence
6223 Dahl albedo of 0.034, while the "Collaborative Asteroid Lightcurve Link" assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 16.8 kilometres, as the higher the albedo (reflectivity), the lower a body's diameter for certain absolute magnitude. This minor planet was named in memory of the Welsh author Roald Dahl (1916–1990), known for his classic children's books "Willy Wonka and the Chocolate Factory" and "James and the Giant Peach". The approved naming citation was published by the Minor Planet Center on 28 August 1996 (). 6223 Dahl 6223 Dahl, provisional designation , is a carbonaceous asteroid from