A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)
Brande, William Thomas, 1788-1866, Cauvin, Joseph · New York : Harper & brothers · leaf 347
are computed from this theorem :—As is the radius to thesine of the latitude, so is the tangent of the hour from noon(reckoning 15° to the hour) to the tangent of the hourangle at the centre. Or, putting h = the hour from noon,( = latitude of the place, and *:=: the hour angle at thecentre of the…
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