Nicolaus Rohlfs

Nicolaus Rohlfs was a German mathematics teacher, an arithmeticus, in Buxtehude and Hamburg, born on 10 March 1695 and dead on 29 September 1750. He wrote astronomical calendars, a book about gardening and other treatises, and the calendars he began were continued by Matthias Rohlfs. His works include a trigonometric calculation of the great solar eclipse of 22 May 1724 as it would appear over the Hamburg horizon, curious tables for finding the hour of the day from the shadow of a walking stick, a method for calculating solar eclipses over any place on Earth of 1734, a Betrachtung of the Sun and Moon of 1736, and a Künstliches Zahlen Spiel of 1742 on making magic squares. His calendar for Brunswick-Lüneburg was published for many years, and a Schleswig-Holstein house and garden almanac followed in Altona.