Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 182
by the effect of precessionand nutation; and their variations (considering theminuteness of the latter effect generally, and the smallnumber of years in comparison of the whole periodof 25,868, for which we ever require to estimatethe effect of the former,) are of that order which maybe regarded as… … adjacent side K P vary by given infinitesimal changesof the position of P: required the changes thence arisingin the other side P X, and the angle K P X ? This is avery simple and easy problem of spherical geometry,and being resolved, it gives at once the reductions we areseeking; for PX being the…
Astronomy
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