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Friedrich Karl Ginzel (26 February 1850, Reichenberg, Bohemia - 29 June 1926, Berlin) was an Austrian astronomer.
From 1877 Ginzel worked at the observatory in Vienna. In 1886 he became a member of the Königlichen Astronomischen Recheninstituts in Berlin, where he was offered a professorship in 1899.
In 1899 he published an important study on solar and lunar eclipses in classical antiquity. His three-volume Handbuch der mathematischen und technischen Chronologie (1906–14; reprinted in 1958 and 2007) is still a standard work on calendars and ancient chronology although some sections are now outdated.
The lunar crater Ginzel was named after him.