File:Nicholson(1825)-(1).svg
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[edit]DescriptionNicholson(1825)-(1).svg |
This method first appeared in Peter Nicholsons A popular Course of Pure and Mixed Mathematics in 1825. It was copied by School World in Jun 1903, then in Kenneth Lynch's, Sundial and Spheres 1971. It starts by drawing the well known triangle, and takes the vertices to draw two circles at radius (OB) sin φ and (AB) tan φ. The 15° lines are drawn, intersecting these circles. Lines are taken horizontally, and vertically from these circles and their intersection point (OB sin t,AB cos t) is on the hour line. That is tan κ = OB sin t/ AB cos t which resolves to sin φ. tan t.
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Source | Own work | |
Author | Photograph by Clem Rutter, Rochester, Kent. (www.clemrutter.net). | |
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current | 21:32, 20 August 2015 | 744 × 744 (48 KB) | ClemRutter (talk | contribs) |
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