Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 43
Fig. 28. 44.- -*What is the Visible Horizon? The Visible Horizon is asmall circle limiting the ob-servers view at sea or theintersection of sea and sky. 0 is the point of observa-tion. H H H is the visible hor-izon of 0. (Fig. 29.) … Fig. 29. 45.—*What is the Sensible Horizon? The Sensible Horizon is aplane at right angles to theplumb-line at the point ofobservation in Fig. 30. H His the Sensible Horizon.
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-348-238.webp)
