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Johannes van Loon (ca. 1611-1686) was a skilled mathematician and astronomer. He began his cartographic career working with Theunis Jacobsz in the 1640s. Thereafter, he worked for Joannes Janssonius, among others. Some of his most notable work are the plates for the celestial atlas by Cellarius. In 1661, van Loon published, with his brother, Gilles, his famed Klaer-Lichtende Noort-Ster ofte Zee Atlas. It had 35 charts and is considered a masterful example of Dutch Golden Age maritime cartography. In 1666, the plates for the atlas passed to Jan Jansson van Waesberge, who then co-published another edition of the atlas with van Loon, this time with 47 charts. By 1676, the atlas had expanded to 50 charts. Waesberge published the atlas until 1706.