[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 59
c is situated. This law, which is true for strata in parallel planes, ex-tends also to parallel spherical strata, except that the nor-mals P i, P c are no longer parallel, but will meet at thecentre of the sphere. But the refraction takes place in thecommon plane of these two normals. 41. The… … REFRACTION. 53 In Fig. 14, the concentric, circles M N represent sectionsof these parallel strata, formed by the vertical plane passingthrough the star S and the zenith of an observer Z E S at A. The normals C A Zat A, and C B E at B,are in this vertical plane.S B, a ray of light fromthe star S,…
Navigation · Nautical astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-28-46.webp)
