![Cysat, Johann Baptist [known as Cysatus] (1586–1657)](https://images.tandf.co.uk/common/jackets/crclarge/978100322/9781003220435.jpg "Cysat, Johann Baptist [known as Cysatus] (1586–1657)")
ABSTRACT
Swiss Jesuit astronomer who used a telescope to discover the Orion Nebula in 1618.
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Swiss Jesuit astronomer who used a telescope to discover the Orion Nebula in 1618.