English: Disappearance of a cargo ship behind the horizon due to the spherical shape of planet Earth in smooth seas and rough seas. You can see further, when the sea is smooth. (J. Krauß, M. Berger: Schiffsführung, Band 1. Springer, Berlin/ Heidelberg 1961. Karl Terheyden, G. Zickwolff: Terrestrische Navigation. In: Navigation. Handbuch für die Schiffsführung, Band 1 / Axel-Springer-Verlag, Berlin/ Heidelberg 1983)
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