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two volumes and was published by Willmann-Bell in 1987. Tirion's sky charts have also been published in astronomy magazines and books, as well as on astronomy websites.

Tirion's early work was largely done by hand, with computer-generated plots as references. In the mid-1990s, he switched to digital illustration.

Tirion died on 5 July 2024 at the age of 81 after a brief illness. The asteroid 4648 Tirion is named for him.

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