Ottens used Johannes Honmann to engrave a copy of John Flamsteed's celestial chart of the southern hemisphere. Flamsteed's 'Atlas Coelestis', published in 1729, was based on observations from the Royal Observatory in Greenwich, seen top left. It also incorporated the findings of other European observatories shown here: Hesse-Cassel and Berlin.

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Part of a southern hemisphere star chart from Reiner Ottens’s Atlas Maior (1730), with the Greenwich Observatory (left) and the Round Tower observatory in Copenhagen (right)