![](http://www.alamy.com/thumbs/6/B705C01B-3346-4FEB-9E8B-44108CBF6FE7/D9DFNW.jpg)
Johannes Hevelius and his wife making astronomical obsrvations using a sextant. From his ''Machinae Coelestis'', Danzig, 1673.
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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: 1673., archival, archive, astronomer, astronomical, astronomy, coelestis, danzig, hevelius, historical, history, johannes, machinae, making, obsrvations, sextant., technology, wife