Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 202
0 is the centre of theearth, OZ the north polar axis, DXE the equator, ZOX themeridian plane through Greenwich, intersecting the surfacein the meridian circle ZGX and the plane of the equatorin OX. Let A be the place on the surface, and let themeridian plane ZOA intersect the surface in the… … Choosing OZX for reference, the polar co-ordinates(r, d, 4>) of the point A would be respectively the earthsradius OA, the aTlatitude ZOA {i.e. 900 - latitude), and thelongitude XOM. In the figure the polar co-ordinates of A are r—OA,6 = angle ZOA, and </> = angle XOM. The problems resolve…
