Question: When was the first solo art exhibition of the author of the book Comet in Moominland ? 
Related documents: [0]  [DOC] Tove Marika Jansson (] ; 9 August 1914 – 27 June 2001) was a Swedish-speaking Finnish novelist, painter, illustrator and comic strip author. Brought up by artistic parents, Jansson studied art from 1930 to 1938 in Stockholm, Helsinki and then Paris. Her first solo art exhibition was in 1943. At the same time, she was writing short stories and articles for publication, as well as creating the graphics for book covers and other purposes. She continued to work as an artist for the rest of her life, alongside her writing. [END] 
[1]  [DOC] Comet in Moominland (Swedish: "Kometjakten" / "Mumintrollet på kometjakt" / "Kometen kommer") is the second in Tove Jansson's series of Moomin books. Published in 1946, it marks the first appearance of several main characters, like Snufkin and the Snork Maiden. [END] 
Answer: 
1943
1943